fix: eglot-booster is only available in 29+ #1493

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 20s
test (ubuntu-latest, 28.2, false)	4m 17s
test (ubuntu-latest, 29.4, false)	3m 36s
test (macos-latest, 27.2, false)	2m 29s
test (macos-latest, 28.2, false)	3m 44s
test (macos-latest, 29.4, false)	3m 42s
test (windows-latest, 27.2, false)	2m 5s
test (windows-latest, 28.2, false)	3m 51s
test (windows-latest, 29.4, false)	4m 9s
test (ubuntu-latest, snapshot, true)	3m 20s
test (macos-latest, snapshot, true)	3m 18s
test (windows-latest, snapshot, true)	2m 45s
	39m 36s

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