Bump sqren/backport-github-action from 8.9.7 to 9.2.1

Bumps [sqren/backport-github-action](https://github.com/sqren/backport-github-action) from 8.9.7 to 9.2.1.
- [Release notes](https://github.com/sqren/backport-github-action/releases)
- [Commits](sorenlouv/backport-github-action@e325a2d...682f871)

---
updated-dependencies:
- dependency-name: sqren/backport-github-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/backport.yml

@@ -21,7 +21,7 @@ jobs:
       contents: write
     steps:
       - name: Backport Action
-        uses: sqren/backport-github-action@e325a2d70df7264afa24c92b1d5feb2278ff63af # v8.9.7
+        uses: sqren/backport-github-action@682f871a79e28f3a79dc87c4098bf2a894d12285 # v9.2.1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           auto_backport_label_prefix: backport-to-