Update supported GitHub Enterprise Server versions #498

Job	Run time
Upload debug artifacts after failure in analyze (nightly-latest)	1m 50s
Upload debug artifacts after failure in analyze (default)	1m 37s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	2m 37s
Upload debug artifacts after failure in analyze (linked)	1m 41s
Download and check debug artifacts after failure in analyze	8s
	7m 53s

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