chore: Use reusable rebase-open-prs-action (#990)

* chore: Use reusable rebase-open-prs-action

Replace inline script with mPokornyETM/rebase-open-prs-action@v1
This makes it easier to reuse across multiple repositories.

* chore: Use reusable rebase-open-prs workflow

Author: mPokornyETM

.github/workflows/rebase-open-prs.yml

@@ -1,31 +1,12 @@
-# Rebase all open PRs when master is updated
-# This keeps PRs up-to-date automatically
-name: Rebase Open PRs
+name: Rebase open PRs
 
 on:
   push:
     branches:
       - master
 
-permissions:
-  contents: write
-  pull-requests: write
-
 jobs:
-  rebase-open-prs:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Rebase all open PRs
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          GH_REPO: ${{ github.repository }}
-        run: |
-          gh pr list --state open --json number,author,isDraft --jq '.[] | select(.isDraft == false) | "\(.number) \(.author.login)"' | while read pr author; do
-            if [ "$author" = "dependabot[bot]" ]; then
-              echo "Requesting rebase for Dependabot PR #$pr"
-              gh pr comment "$pr" --body "@dependabot rebase"
-            else
-              echo "Updating branch for PR #$pr"
-              gh pr update-branch --rebase "$pr" || true
-            fi
-          done
+  rebase-prs:
+    uses: mPokornyETM/rebase-open-prs-action/.github/workflows/rebase-open-prs.yml@v1
+    secrets:
+      GH_PAT: ${{ secrets.GH_TOKEN_PAT }}