Ignore Dependabot bot in syncbot workflow

Fixes #460

Author: edeandrea

.github/workflows/syncbot.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   mirror-changes:
     runs-on: ubuntu-latest
-    if: github.actor != 'dependabot[bot]
+    if: github.actor != 'dependabot[bot]'
     steps:
       - uses: actions/checkout@v6