Update supported GitHub Enterprise Server versions #3788

Job	Run time
Resolve environment (macos-latest, default)	2m 1s
Resolve environment (ubuntu-latest, default)	33s
Resolve environment (windows-latest, default)	3m 40s
Resolve environment (ubuntu-latest, linked)	34s
Resolve environment (macos-latest, linked)	2m 31s
Resolve environment (windows-latest, nightly-latest)	3m 47s
Resolve environment (windows-latest, linked)	4m 5s
Resolve environment (macos-latest, nightly-latest)	1m 40s
Resolve environment (ubuntu-latest, nightly-latest)	33s
	19m 24s

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