fix: Bundle analysis message (#13161)

.github/workflows/nextjs-bundle-analysis.yml

@@ -69,7 +69,7 @@ jobs:
           body="${body//'%'/'%25'}"
           body="${body//$'\n'/'%0A'}"
           body="${body//$'\r'/'%0D'}"
-          echo "{body}={$body}" >> $GITHUB_OUTPUT
+          echo "{body}=${body}" >> $GITHUB_OUTPUT
 
       - name: Find Comment
         uses: peter-evans/find-comment@v2