Bump minimum CodeQL version to 2.16.6 #550

Job	Run time
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 56s
Upload debug artifacts after failure in analyze (linked)	1m 45s
Upload debug artifacts after failure in analyze (nightly-latest)	2m 24s
Upload debug artifacts after failure in analyze (default)	1m 44s
Download and check debug artifacts after failure in analyze	9s
	7m 58s

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