fix(language-server): add @vue/typescript-plugin back to the dependency

Author: johnsoncodehk

packages/language-server/package.json

@@ -19,6 +19,7 @@
 		"@volar/language-server": "2.4.14",
 		"@vue/language-core": "3.0.0-beta.1",
 		"@vue/language-service": "3.0.0-beta.1",
+		"@vue/typescript-plugin": "3.0.0-beta.1",
 		"vscode-uri": "^3.0.8"
 	},
 	"peerDependencies": {