Update supported GitHub Enterprise Server versions #4340

Job	Run time
Resolve environment (windows-latest, linked)	1m 15s
Resolve environment (ubuntu-latest, linked)	35s
Resolve environment (ubuntu-latest, default)	40s
Resolve environment (ubuntu-latest, nightly-latest)	45s
Resolve environment (windows-latest, nightly-latest)	2m 56s
Resolve environment (macos-latest, linked)	1m 42s
Resolve environment (windows-latest, default)	1m 9s
Resolve environment (macos-latest, nightly-latest)	1m 47s
Resolve environment (macos-latest, default)	2m 22s
	13m 11s

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