Enable rebuilding PRs with conflicts #5279

Job	Run time
Ruby analysis (ubuntu-latest, default)	1m 4s
Ruby analysis (macos-latest, linked)	1m 25s
Ruby analysis (ubuntu-latest, linked)	1m 5s
Ruby analysis (macos-latest, nightly-latest)	1m 24s
Ruby analysis (ubuntu-latest, nightly-latest)	1m 7s
Ruby analysis (macos-latest, default)	1m 21s
	7m 26s

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