Bump minimum CodeQL version to 2.16.6 #580

Job	Run time
Upload debug artifacts after failure in analyze (default)	2m 11s
Upload debug artifacts after failure in analyze (nightly-latest)	2m 12s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 47s
Upload debug artifacts after failure in analyze (linked)	2m 16s
Download and check debug artifacts after failure in analyze	6s
	8m 32s

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