Update spit-the-diff.yml

Author: ssfinney

.github/workflows/spit-the-diff.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Generate PR summary
-        uses: ssfinney/spit-the-diff@v1
+        uses: ssfinney/spit-the-diff@v1.1.1
         with:
           format: haiku
           openai_api_key: ${{ secrets.OPENAI_API_KEY }}