Update dependency @rollup/pluginutils to v5 (#30)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -63,7 +63,7 @@
   },
   "dependencies": {
     "@fluent/syntax": "^0.18.1",
-    "@rollup/pluginutils": "^4.2.1",
+    "@rollup/pluginutils": "^5.0.0",
     "magic-string": "^0.26.2",
     "unplugin": "^0.10.0"
   },