Update supported GitHub Enterprise Server versions #5063

Job	Run time
Ruby analysis (ubuntu-latest, linked)	49s
Ruby analysis (macos-latest, linked)	1m 9s
Ruby analysis (macos-latest, nightly-latest)	1m 5s
Ruby analysis (ubuntu-latest, nightly-latest)	46s
Ruby analysis (ubuntu-latest, default)	46s
Ruby analysis (macos-latest, default)	56s
	5m 31s

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