Update supported GitHub Enterprise Server versions #8184

Job	Run time
Ruby analysis (macos-latest, default)	19s
Ruby analysis (ubuntu-latest, linked)	18s
Ruby analysis (ubuntu-latest, default)	18s
Ruby analysis (macos-latest, linked)	17s
Ruby analysis (macos-latest, nightly-latest)	20s
Ruby analysis (ubuntu-latest, nightly-latest)	17s
	1m 49s

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