tools: check timezone current version

.github/workflows/timezone-update.yml

@@ -34,12 +34,22 @@ jobs:
       - name: Record new version
         run: echo "new_version=$(ls icu-data/tzdata/icunew | tail -1)" >> $GITHUB_ENV
 
+      - name: Record current version
+        run: echo "current_version=$(node -e 'console.log(process.versions.tz)')" >> $GITHUB_ENV
+
+      - name: Compare versions
+        run: |
+          echo "Comparing current version ${{ env.current_version }} to new version ${{ env.new_version }}"
+
       - run: ./tools/update-timezone.mjs
+        if: ${{ env.new_version != env.current_version }}
 
       - name: Update the expected timezone version in test
+        if: ${{ env.new_version != env.current_version }}
         run: echo "${{ env.new_version }}" > test/fixtures/tz-version.txt
 
       - name: Open Pull Request
+        if: ${{ env.new_version != env.current_version }}
         uses: gr2m/create-or-update-pull-request-action@77596e3166f328b24613f7082ab30bf2d93079d5  # Create a PR or update the Action's existing PR
         env:
           GITHUB_TOKEN: ${{ secrets.GH_USER_TOKEN }}