Bump simplybusiness/dobby from 3.1.1 to 3.5.3

Bumps [simplybusiness/dobby](https://github.com/simplybusiness/dobby) from 3.1.1 to 3.5.3.
- [Release notes](https://github.com/simplybusiness/dobby/releases)
- [Commits](simplybusiness/dobby@v3.1.1...v3.5.3)

---
updated-dependencies:
- dependency-name: simplybusiness/dobby
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/dobby-actions.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           bundler-cache: true
       - name: Bump version
-        uses: simplybusiness/dobby@v3.1.1
+        uses: simplybusiness/dobby@v3.5.3
         env:
           DOBBY_APP_ID: ${{ secrets.DOBBY_APP_ID }}
           DOBBY_PRIVATE_KEY: ${{ secrets.DOBBY_PRIVATE_KEY }}