chore: revert to standalone release please action

Author: yannispgs

.github/workflows/release-pr.yml

@@ -7,6 +7,10 @@ on:
 jobs:
   release-pr:
     name: Maintain Release PR
-    uses: p3ol/actions/.github/workflows/release-pr.yml@v1.0.0
-    secrets:
-      github-token: ${{ secrets.GH_RELEASE_PLEASE_TOKEN_PUBLIC }}
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.GH_RELEASE_PLEASE_TOKEN_PUBLIC }}
+          config-file: .github/release-please.config.json
+          manifest-file: .github/release-please.manifest.json