fix(renovate): Restrict rangeStrategy: widen to npm packages

renovate.json

 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["local>funkwhale/ci//renovate"],
+  "packageRules": [
+    {
+      "matchManagers": ["npm"],
       "rangeStrategy": "widen"
     }
+  ]
+}