github-actions(deps): bump sorenlouv/backport-github-action

Bumps [sorenlouv/backport-github-action](https://github.com/sorenlouv/backport-github-action) from 10.2.0 to 10.4.0.
- [Release notes](https://github.com/sorenlouv/backport-github-action/releases)
- [Commits](sorenlouv/backport-github-action@v10.2.0...v10.4.0)

---
updated-dependencies:
- dependency-name: sorenlouv/backport-github-action
  dependency-version: 10.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/backport.yaml

@@ -11,7 +11,7 @@ jobs:
     if: "${{ github.event.pull_request.merged == true }}"
     steps:
       - name: "Backport Action"
-        uses: "sorenlouv/backport-github-action@v10.2.0"
+        uses: "sorenlouv/backport-github-action@v10.4.0"
         with:
           github_token: "${{ secrets.BOT_TOKEN }}"
           auto_backport_label_prefix: "auto-backport-to-"