Restore @vue/compiler-dom to 3.4.27

This effectively reverts #774 (commit 0656354) and part of #778
(commit 4d91a4e) – we want to stay on the same Vue version as
MediaWiki core (see README).

package.json

@@ -60,7 +60,7 @@
 		"@typescript-eslint/eslint-plugin": "^7.18.0",
 		"@typescript-eslint/parser": "^7.18.0",
 		"@vitejs/plugin-vue": "^5.1.4",
-		"@vue/compiler-dom": "^3.5.12",
+		"@vue/compiler-dom": "^3.4.27",
 		"@vue/eslint-config-typescript": "^13.0.0",
 		"@vue/server-renderer": "^3.4.27",
 		"@vue/test-utils": "^2.4.6",