chore(language-server): remove vscode-languageserver-protocol dependency

Author: johnsoncodehk

packages/language-server/package.json

@@ -21,7 +21,6 @@
 		"@vue/language-core": "3.0.0-alpha.10",
 		"@vue/language-service": "3.0.0-alpha.10",
 		"@vue/typescript-plugin": "3.0.0-alpha.10",
-		"vscode-languageserver-protocol": "^3.17.5",
 		"vscode-uri": "^3.0.8"
 	},
 	"peerDependencies": {