increase VARCHAR size of message link column

[danthe1st]

When a message contains an attachment link that's too big, synchronizing the message cache may fail. This can result in the /redeploy command failing (resulting in the bot not being stopped) as well:

Feb 04 15:06:32 instance-20240715-2322 bash[1671881]: MERGE INTO message_cache_attachments (message_id, attachment_index, link) VALUES (?, ?, ?) [22001-232]
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:100)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:102)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1548)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:688)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:710)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.core.JdbcTemplate.batchUpdate(JdbcTemplate.java:1042)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at net.discordjug.javabot.data.h2db.message_cache.dao.MessageCacheRepository.insertList(MessageCacheRepository.java:56)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.lang.reflect.Method.invoke(Method.java:565)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:158)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:135)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:719)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at net.discordjug.javabot.data.h2db.message_cache.dao.MessageCacheRepository$$SpringCGLIB$$0.insertList(<generated>)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at net.discordjug.javabot.data.h2db.message_cache.MessageCache.synchronizeNow(MessageCache.java:99)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at net.discordjug.javabot.systems.staff_commands.RedeployCommand.execute(RedeployCommand.java:66)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at xyz.dynxsty.dih4jda.InteractionHandler.handleSlashCommand(InteractionHandler.java:538)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at xyz.dynxsty.dih4jda.InteractionHandler.lambda$onSlashCommandInteraction$16(InteractionHandler.java:643)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1825)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1817)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at java.base@25.0.1/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.graalvm.nativeimage.builder/com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:832)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.graalvm.nativeimage.builder/com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:808)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]: Caused by: org.h2.jdbc.JdbcBatchUpdateException: Value too long for column "LINK CHARACTER VARYING(255)": "'https://cdn.discordapp.com/attachments/653632583594278923/1466419532
934414560/T... (268)"; SQL statement:
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]: MERGE INTO message_cache_attachments (message_id, attachment_index, link) VALUES (?, ?, ?) [22001-232]
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.h2.jdbc.JdbcPreparedStatement.executeBatch(JdbcPreparedStatement.java:1277)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at com.zaxxer.hikari.pool.ProxyStatement.executeBatch(ProxyStatement.java:128)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeBatch(HikariProxyPreparedStatement.java)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.core.JdbcTemplate.lambda$getPreparedStatementCallback$0(JdbcTemplate.java:1608)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:669)
Feb 04 15:06:32 instance-20240715-2322 bash[1671881]:         ... 23 more