chore(language-server): move @volar/test-utils to devDependencies

Author: johnsoncodehk

packages/language-server/package.json

@@ -18,7 +18,6 @@
 	"dependencies": {
 		"@volar/language-core": "~2.4.13",
 		"@volar/language-server": "~2.4.13",
-		"@volar/test-utils": "~2.4.13",
 		"@vue/language-core": "3.0.0-alpha.10",
 		"@vue/language-service": "3.0.0-alpha.10",
 		"@vue/typescript-plugin": "3.0.0-alpha.10",
@@ -29,6 +28,7 @@
 		"typescript": "*"
 	},
 	"devDependencies": {
-		"@typescript/server-harness": "latest"
+		"@typescript/server-harness": "latest",
+		"@volar/test-utils": "~2.4.13"
 	}
 }