cask: fewer GitHub Actions warnings. #31851

Job	Run time
syntax	45s
formula audit	5m 32s
test default formula (Ubuntu 22.04)	1m 50s
tap syntax	6m 31s
test default formula (Ubuntu 20.04)	3m 32s
tests (online)	5m 57s
update-test (Ubuntu)	24s
test default formula (macOS 13 x86_64)	3m 25s
tests (generic OS)	3m 20s
update-test (macOS)	23s
tests (Ubuntu 24.04)	3m 9s
vendored gems	36s
tests (Ubuntu 22.04)	3m 23s
test default formula (macOS 15 arm64)	1m 26s
tests (Ubuntu 20.04)	3m 23s
cask audit	3m 3s
tests (macOS 13 x86_64)	9m 36s
tests (macOS 15 arm64)	9m 20s
	1h 5m 35s

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