Update default bundle to 2.20.5 #4444

Job	Run time
Ruby analysis (ubuntu-latest, nightly-latest)	41s
Ruby analysis (ubuntu-latest, linked)	41s
Ruby analysis (ubuntu-latest, default)	43s
Ruby analysis (macos-latest, linked)	1m 2s
Ruby analysis (macos-latest, nightly-latest)	1m 19s
Ruby analysis (macos-latest, default)	1m 14s
	5m 40s

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