ci: bump jobs to use 3.13, fixes for ubuntu 24.04

[davidhewitt]

Also reformatted the YAML at the same time 🙈

[codspeed-hq]

CodSpeed Performance Report

Merging #154 will degrade performances by 12.21%

_{Comparing dh/ci-bumps (bfd6d2a) with main (1f945c8)}

Summary

❌ 1 regressions
✅ 72 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	dh/ci-bumps	Change
❌	unicode_serde_value	7.9 µs	9 µs	-12.21%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.94%. Comparing base (1f945c8) to head (bfd6d2a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #154   +/-   ##
=======================================
  Coverage   90.94%   90.94%           
=======================================
  Files          12       12           
  Lines        2042     2042           
  Branches     2042     2042           
=======================================
  Hits         1857     1857           
  Misses        112      112           
  Partials       73       73           

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