🔧(renovate) open pull request with a default noChangeLog label

Discussed with @sampaccoud, Renovate PR do not necessitate ChangeLog updates
Our CI system requires a 'noChangeLog' label or an updated ChangeLog. Currently,
we manually add the label for each Renovate PR.

To improve DX, we configured Renovate to apply the label automatically.

renovate.json

@@ -1,6 +1,7 @@
 {
   "extends": ["github>numerique-gouv/renovate-configuration"],
   "dependencyDashboard": true,
+  "labels": ["dependencies", "noChangeLog"],
   "packageRules": [
     {
       "enabled": false,