Bump minimum CodeQL Bundle version to 2.17.6 #6098

Job	Run time
Ruby analysis (ubuntu-latest, default)	50s
Ruby analysis (ubuntu-latest, linked)	51s
Ruby analysis (macos-latest, nightly-latest)	54s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (macos-latest, linked)	54s
Ruby analysis (macos-latest, default)	53s
	5m 12s

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