Remove experimental notices for Nexus (#1381) #4443

Job	Run time
test-latest-deps	13m 29s
build-lint-test (3.14, ubuntu-latest)	12m 8s
build-lint-test (3.10, ubuntu-arm)	12m 42s
build-lint-test (3.10, macos-arm)	12m 32s
build-lint-test (3.10, ubuntu-latest)	28m 22s
features-tests / test	7m 1s
build-lint-test (3.10, macos-intel)	20m 4s
build-lint-test (3.14, macos-arm)	11m 5s
build-lint-test (3.10, windows-latest)	17m 9s
build-lint-test (3.14, ubuntu-arm)	12m 32s
build-lint-test (3.14, windows-latest)	16m 10s
build-lint-test (3.14, macos-intel)	22m 0s
	3h 5m 14s

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