Update to Python 3.12.x

[robhudson]

One-line summary

We held off on upgrading to Python 3.12 earlier this year to wait for more releases (stability). We're at 3.12.6 to date so we feel safe to upgrade now.

• I used an AI to write some of this code.

Testing

Verify integration tests pass.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.83%. Comparing base (cc9d106) to head (420a59f).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
...nagement/commands/update_root_store_policy_page.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15161   +/-   ##
=======================================
  Coverage   77.83%   77.83%           
=======================================
  Files         162      162           
  Lines        8459     8459           
=======================================
  Hits         6584     6584           
  Misses       1875     1875           

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[robhudson]

Integration tests pass: https://github.com/mozilla-sre-deploy/deploy-bedrock/actions/runs/10891211452

[pmac]

But they'll be so sad! 🤣

[robhudson]

But they'll be so sad! 🤣

Yeah but they have grassroots, they'll be fine.