Update supported GitHub Enterprise Server versions #3110

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-20230403)	1m 0s
Go: tracing with custom build steps (macos-12, stable-20230403)	2m 38s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.13.5)	58s
Go: tracing with custom build steps (macos-12, stable-v2.13.5)	2m 58s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.14.6)	1m 3s
Go: tracing with custom build steps (macos-12, stable-v2.14.6)	2m 59s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.15.5)	3m 27s
Go: tracing with custom build steps (macos-latest, stable-v2.15.5)	2m 19s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.16.6)	1m 12s
Go: tracing with custom build steps (macos-latest, stable-v2.16.6)	2m 33s
Go: tracing with custom build steps (ubuntu-latest, default)	46s
Go: tracing with custom build steps (macos-latest, default)	2m 52s
Go: tracing with custom build steps (ubuntu-latest, linked)	59s
Go: tracing with custom build steps (macos-latest, linked)	2m 3s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	1m 15s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 28s
	31m 30s

Provide feedback