Switch to Python 3.14, drop support for Python 3.9 (#705) #4415

Job	Run time
pre-commit / check-file-sizes	5s
pre-commit / pre-commit	1m 20s
mac / clang-build (Release)	3m 2s
windows / msvc-build (Release)	1m 40s
mac / clang-build (Debug)	2m 29s
windows / clang-build	1m 59s
windows / msvc-build (Debug)	2m 44s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 4s
ubuntu / clang-build (ubuntu-24.04-arm)	2m 0s
ubuntu / clang-build (ubuntu-24.04)	2m 24s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 21s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 40s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 43s
mac / clang-test	6m 20s
windows / clang-test	3m 12s
ubuntu / gcc-test (ubuntu-24.04)	8m 22s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 38s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 34s
ubuntu / clang-test (ubuntu-24.04)	8m 27s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 28s
windows / msvc-test	4m 54s
mac / clang-test-extended	2m 33s
windows / clang-test-extended	2m 52s
windows / msvc-test-extended	2m 49s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 26s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 31s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 50s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 29s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 31s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 25s
ubuntu / gcc-build-codecov	7m 37s
perf / macos-clang-build-perf-stats	2m 11s
perf / ubuntu-gcc-build-perf-stats	1m 29s
pages / build-doxygen-xml	21s
pages / build-scoreboard	19s
pages / build-sphinx	47s
pages / deploy-pages	15s
	2h 1m 51s

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