build(deps): bump kamatama41/get-pr-number-action from 0.7.0 to 0.9.1

Bumps [kamatama41/get-pr-number-action](https://github.com/kamatama41/get-pr-number-action) from 0.7.0 to 0.9.1.
- [Release notes](https://github.com/kamatama41/get-pr-number-action/releases)
- [Commits](kamatama41/get-pr-number-action@5c77b38...0bcaab5)

---
updated-dependencies:
- dependency-name: kamatama41/get-pr-number-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/pull-request.yml

@@ -139,7 +139,7 @@ jobs:
 
       - name: Get PR number
         if: ${{ github.event_name != 'schedule' }}
-        uses: kamatama41/get-pr-number-action@5c77b38a1b4974ebf8a9521a689f38a5898eadd6 # v0.7.0
+        uses: kamatama41/get-pr-number-action@0bcaab5752c0b699149e74667c8ce2f764cbb7fa # v0.9.1
         id: action
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}