Upgrade Python 3.10 -> 3.13

[ghickman]

Blocked by #259

Django 3.1.14 has a dependency on distutils.

[meshy]

Thank you! I need to double-check that no extra steps are required server-side before merging this.

[ghickman]

I should probably run through this PR after the remaining dependencies are updated to make sure there are no changes to the compiled requirements with each version as well.

[meshy]

@ghickman The last of the requirements updates have been merged now -- thank you! 🌟

I'll look into how this will affect deployment now.

[meshy]

So, weirdly, it looks like we've been running Python 3.11 in prod already.

I need to change an env-var to the required version in Render's UI. Once this is ready (and I'm not on a train) I'll merge this and set the version as required.

[ghickman]

@meshy – awesome 🎉

I've rebased this branch on top of main, and run make compile on each commit to make sure we have any python-version-related changes included.