fix prerelease check to allow standard release #31848

Job	Run time
syntax	35s
formula audit	5m 37s
cask audit	3m 7s
tests (online)	5m 12s
tap syntax	6m 13s
tests (generic OS)	3m 10s
vendored gems	40s
test default formula (Ubuntu 22.04)	1m 48s
test default formula (Ubuntu 20.04)	2m 53s
test default formula (macOS 13 x86_64)	4m 18s
update-test (Ubuntu)	14s
tests (Ubuntu 24.04)	3m 15s
test default formula (macOS 15 arm64)	1m 15s
update-test (macOS)	32s
tests (Ubuntu 22.04)	3m 13s
tests (Ubuntu 20.04)	3m 20s
tests (macOS 13 x86_64)	9m 47s
tests (macOS 15 arm64)	4m 51s
	1h 0m 0s

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