Remove sphinx workaround #5422

Job	Run time
Build sdist and set version	35s
build-cpp-test-linux (debug, gcc)	19m 34s
build-cpp-test-linux (debug, clang)	12m 5s
build-cpp-test-linux (release, gcc)	36m 35s
build-cpp-test-linux (release, clang)	19m 10s
Build and test in Conda (ubuntu)	2m 35s
Build and test in Conda (windows)	5m 40s
build-cpp-test-macos (debug)	14m 24s
build-cpp-test-macos (release)	9m 9s
build-cpp-test-windows (debug, msvc)	13m 28s
build-cpp-test-windows (debug, clang-cl)	16m 52s
build-cpp-test-windows (release, msvc)	18m 51s
build-cpp-test-windows (release, clang-cl)	21m 56s
build-and-test-python (linux-x64)	10m 28s
build-and-test-python (linux-aarch64)	38m 10s
build-and-test-python (macos)	5m 48s
build-and-test-python (windows)	11m 10s
publish-wheels	5s
	4h 16m 35s

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