Update sync_leetcode.yml

Use `joshcai/[email protected]`

Author: jimit105

.github/workflows/sync_leetcode.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
     - name: Sync Leetcode Submissions
-      uses: joshcai/leetcode-sync@master
+      uses: joshcai/leetcode-sync@v1.6
       with:
         github-token: ${{ github.token }}
         leetcode-csrf-token: ${{ secrets.LEETCODE_CSRF_TOKEN }}