[CI] adjusted PHP matrix for Rector job

Author: konradoboza

.github/workflows/rector.yaml

@@ -8,6 +8,10 @@ on:
 jobs:
     rector:
         name: Run rector
+        strategy:
+            matrix:
+                php:
+                    - '8.3'
         uses: ibexa/gh-workflows/.github/workflows/rector.yml@main
         secrets:
             SATIS_NETWORK_KEY: ${{ secrets.SATIS_NETWORK_KEY }}