Update supported GitHub Enterprise Server versions #7000

Job	Run time
Packaging: Config file (ubuntu-latest, linked)	1m 14s
Packaging: Config file (macos-latest, linked)	1m 24s
Packaging: Config file (windows-latest, nightly-latest)	4m 23s
Packaging: Config file (windows-latest, linked)	4m 9s
Packaging: Config file (ubuntu-latest, default)	1m 21s
Packaging: Config file (macos-latest, nightly-latest)	1m 12s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 19s
Packaging: Config file (macos-latest, default)	1m 31s
Packaging: Config file (windows-latest, default)	4m 39s
	21m 12s

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