Run bundle install at release workflow (#580)

It fixes the issue where the release workflow fails because the `bundle
install` is not running.
Actual failure log:
http://github.com/line/line-bot-sdk-ruby/actions/runs/14963670963/job/42029838206#step:5:66

---------

Co-authored-by: Yuta Kasai <kasai.yuta0810@gmail.com>

Author: mokuzon

.github/workflows/publish.yml

@@ -16,13 +16,15 @@ jobs:
     permissions:
       id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
       contents: write # IMPORTANT: this permission is required for `rake release` to push the release tag
+      issues: write
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1.238.0
         with:
           bundler-cache: true
           ruby-version: 3.3
+      - run: bundle install
       - name: Update version file with the release version
         run: |
           if [ "${{ github.event_name }}" == "workflow_dispatch" ]; then