Fix bundler mode to deployment at publish (#582)

fix #581

#580 was not sufficient.

If there is a difference between the installed gems and `Gemfile.lock`,
an error occurs when publishing.
Therefore, we need to set `deployment` mode so that `bundle install` is
performed with the contents of `Gemfile.lock`.

Author: mokuzon

.github/workflows/publish.yml

@@ -24,7 +24,7 @@ jobs:
         with:
           bundler-cache: true
           ruby-version: 3.3
-      - run: bundle install
+      - run: bundle install --deployment
       - name: Update version file with the release version
         run: |
           if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then