Improve `concurrency` settings for PR checks #6715

Job	Run time
Ruby analysis (ubuntu-latest, nightly-latest)	48s
Ruby analysis (ubuntu-latest, linked)	51s
Ruby analysis (macos-latest, nightly-latest)	1m 39s
Ruby analysis (ubuntu-latest, default)	50s
Ruby analysis (macos-latest, default)	1m 17s
Ruby analysis (macos-latest, linked)	1m 0s
	6m 25s

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