lsp-roslyn: make it compatibale with emacs-lsp-booster for windows (#… #5387

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 14s
test (ubuntu-latest, 28.2, false)	2m 37s
test (ubuntu-latest, 29.4, false)	2m 32s
test (macos-latest, 28.2, false)	3m 32s
test (macos-latest, 29.4, false)	4m 16s
test (windows-latest, 27.2, false)	3m 47s
test (windows-latest, 28.2, false)	3m 59s
test (windows-latest, 29.4, false)	3m 53s
test (ubuntu-latest, snapshot, true)	1m 22s
test (macos-latest, snapshot, true)	2m 47s
test (windows-latest, snapshot, true)	5m 22s
	36m 21s

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