build(deps): bump korthout/backport-action from 2.1.0 to 2.1.1

Bumps [korthout/backport-action](https://github.com/korthout/backport-action) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](https://github.com/korthout/backport-action/compare/v2.1.0...v2.1.1)

---
updated-dependencies:
- dependency-name: korthout/backport-action
dependency-type: direct:production
update-type: version-update:semver-patch
...

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

Changed files
+1 -1
.github
workflows
+1 -1
.github/workflows/backport.yml
···
with:
ref: ${{ github.event.pull_request.head.sha }}
- name: Create backport PRs
-
uses: korthout/backport-action@v2.1.0
+
uses: korthout/backport-action@v2.1.1
with:
# Config README: https://github.com/korthout/backport-action#backport-action
copy_labels_pattern: 'severity:\ssecurity'