Update auto-merge condition for Dependabot PRs to include 'null' update type

Author: max-ostapenko

.github/workflows/ci.yaml

@@ -57,7 +57,7 @@ jobs:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
 
       - name: Enable auto-merge for Dependabot PRs
-        if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'
+        if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.update-type == 'null'
         run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{github.event.pull_request.html_url}}