ci: Remove deprecated macos-12 image

[philipphofmann]

macos-12 runners will be fully unsupported by December 3rd, 2024, and are already deprecated. We have to remove them.

GH actions issue: actions/runner-images#10721

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.316%. Comparing base (149877e) to head (18b0e8e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4450       +/-   ##
=============================================
- Coverage   91.318%   91.316%   -0.003%     
=============================================
  Files          609       610        +1     
  Lines        49855     49943       +88     
  Branches     17932     18029       +97     
=============================================
+ Hits         45527     45606       +79     
- Misses        4236      4245        +9     
  Partials        92        92               

see 21 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1233.98 ms	1254.31 ms	20.33 ms
Size	21.90 KiB	707.65 KiB	685.75 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
0d32275	1229.62 ms	1246.51 ms	16.89 ms
42ef6ba	1201.67 ms	1214.35 ms	12.67 ms
888a145	1235.15 ms	1254.82 ms	19.67 ms
3bf3c92	1236.94 ms	1253.00 ms	16.06 ms
c3e8f71	1243.00 ms	1251.81 ms	8.81 ms
8cd6cfa	1229.88 ms	1251.45 ms	21.57 ms
c021422	1237.12 ms	1263.18 ms	26.06 ms
4053ee9	1243.71 ms	1257.84 ms	14.12 ms
706c41f	1234.67 ms	1245.94 ms	11.27 ms
e90aa6d	1277.38 ms	1303.18 ms	25.81 ms

App size

Revision	Plain	With Sentry	Diff
0d32275	22.84 KiB	403.13 KiB	380.29 KiB
42ef6ba	21.58 KiB	417.86 KiB	396.28 KiB
888a145	21.58 KiB	713.54 KiB	691.95 KiB
3bf3c92	21.58 KiB	706.06 KiB	684.48 KiB
c3e8f71	21.58 KiB	573.05 KiB	551.47 KiB
8cd6cfa	21.58 KiB	571.85 KiB	550.26 KiB
c021422	20.76 KiB	435.64 KiB	414.88 KiB
4053ee9	20.76 KiB	435.22 KiB	414.46 KiB
706c41f	21.58 KiB	699.25 KiB	677.67 KiB
e90aa6d	21.58 KiB	418.82 KiB	397.24 KiB