Update supported GitHub Enterprise Server versions #4100

Job	Run time
Resolve environment (macos-latest, default)	2m 0s
Resolve environment (macos-latest, linked)	2m 46s
Resolve environment (ubuntu-latest, linked)	35s
Resolve environment (ubuntu-latest, default)	40s
Resolve environment (windows-latest, nightly-latest)	2m 42s
Resolve environment (windows-latest, linked)	1m 12s
Resolve environment (windows-latest, default)	1m 7s
Resolve environment (macos-latest, nightly-latest)	2m 24s
Resolve environment (ubuntu-latest, nightly-latest)	53s
	14m 19s

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