Fix name of GitHub Action job (#483)

Author: outdooracorn

.github/workflows/wbstack.sync.check.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v3.3.0
       - name: run sync
         run: ./sync.sh
-      - name: Show `git diff`` output
+      - name: Show `git diff` output
         run: git diff
       - name: Check only composer changed
         run: |