Bump cirrus-actions/rebase from 1.7 to 1.8

Bumps [cirrus-actions/rebase](https://github.com/cirrus-actions/rebase) from 1.7 to 1.8.
- [Release notes](https://github.com/cirrus-actions/rebase/releases)
- [Commits](https://github.com/cirrus-actions/rebase/compare/6e572f08c244e2f04f9beb85a943eb618218714d...b87d48154a87a85666003575337e27b8cd65f691)

---
updated-dependencies:
- dependency-name: cirrus-actions/rebase
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/command-rebase.yml

@@ -37,7 +37,7 @@ jobs:
           token: ${{ secrets.COMMAND_BOT_PAT }}
 
       - name: Automatic Rebase
-        uses: cirrus-actions/rebase@6e572f08c244e2f04f9beb85a943eb618218714d # 1.7
+        uses: cirrus-actions/rebase@b87d48154a87a85666003575337e27b8cd65f691 # 1.8
         env:
           GITHUB_TOKEN: ${{ secrets.COMMAND_BOT_PAT }}