Update main_py_to_bitly.yml

Author: skysign

.github/workflows/main_py_to_bitly.yml

@@ -8,9 +8,9 @@
       outputs:
         output1: ${{ steps.step1.outputs }}
       steps:
-        - uses: actions/checkout@v3      
-          with: 
-            fetch-depth: 1
+        - uses: actions/checkout@v4
+          with:
+            fetch-depth: 2
         - id: step1
           run: git diff --name-only HEAD~1 HEAD | grep '/main.py'
     job2: