fix(ci): dependabot auto-merge uses squash, not merge commit (#5)

The repo only allows squash merges on protected main, so the
auto-merge workflow was failing with:

  Merge method merge commits are not allowed on this repository

Switch --merge → --squash in both semver-minor and semver-patch
auto-merge steps.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: abkrim

.github/workflows/dependabot-auto-merge.yml

@@ -20,14 +20,14 @@ jobs:
 
       - name: Auto-merge Dependabot PRs for semver-minor updates
         if: ${{steps.metadata.outputs.update-type == 'version-update:semver-minor'}}
-        run: gh pr merge --auto --merge "$PR_URL"
+        run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{github.event.pull_request.html_url}}
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
 
       - name: Auto-merge Dependabot PRs for semver-patch updates
         if: ${{steps.metadata.outputs.update-type == 'version-update:semver-patch'}}
-        run: gh pr merge --auto --merge "$PR_URL"
+        run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{github.event.pull_request.html_url}}
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}