Use CMake's Sphinx detection #3836

Job	Run time
pre-commit / pre-commit	1m 23s
windows / msvc-build (Release)	1m 39s
windows / msvc-build (Debug)	2m 50s
windows / clang-build	2m 5s
ubuntu / clang-build (ubuntu-24.04)	1m 12s
ubuntu / gcc-build (ubuntu-24.04, Debug)	47s
ubuntu / gcc-build (ubuntu-24.04, Release)	1m 0s
ubuntu / clang-build (ubuntu-24.04-arm)	58s
mac / clang-build (Release)	1m 53s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 4s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	58s
mac / clang-build (Debug)	1m 49s
ubuntu / gcc-test (ubuntu-24.04)	8m 23s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 29s
ubuntu / clang-test (ubuntu-24.04)	8m 28s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	49s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 26s
mac / clang-test	4m 52s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 51s
windows / clang-test	2m 59s
windows / msvc-test	4m 55s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 24s
windows / clang-test-extended	2m 59s
mac / clang-test-extended	3m 6s
windows / msvc-test-extended	2m 57s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 34s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 35s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 44s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 29s
ubuntu / gcc-build-codecov	5m 58s
perf / ubuntu-gcc-build-perf-stats	1m 41s
perf / macos-clang-build-perf-stats	1m 44s
pages / build-scoreboard	11s
pages / build-doxygen-xml	1m 8s
pages / build-sphinx	1m 12s
pages / deploy-pages	-1s
	1h 49m 31s

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