action: remove a lingering mention of PEP 740 being experimental #207

Job	Run time
smoke-test / fail-fast (macos-latest)	8s
smoke-test / legit-pr	3s
smoke-test / smoke-test (ubuntu-22.04)	1m 14s
smoke-test / smoke-test (ubuntu-24.04)	1m 3s
smoke-test / fail-fast (windows-latest)	18s
check	5s
build-and-push	0s
	2m 51s

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