[READY]General CI updates

[bstaletic]

I'm not sure if we want to merge this immediately, or wait for october, so that we can actually drop python 3.8.

Quick summary:

• Switch to ubuntu 24.04
• Switch to macos 14
• Switch to python 3.9
• Install mono-complete
• Redo valgrind
• Update actions
• Use python 3.13 in valgrind run
• Workaround for cgi module being removed
• Fix bindings test in newer python

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This change is 

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.92%. Comparing base (01efad8) to head (61a17fe).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1746 +/- ## ========================================== + Coverage 95.86% 95.92% +0.05% ========================================== Files 84 84 Lines 8421 8437 +16 Branches 163 163 ========================================== + Hits 8073 8093 +20 + Misses 298 294 -4 Partials 50 50 ```