Update cpplint_modified_files.yml

Author: cclauss

.github/workflows/cpplint_modified_files.yml

@@ -11,7 +11,7 @@ jobs:
   cpplint_modified_files:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4  # v1, NOT v2 or v3
+      - uses: actions/checkout@v1  # v1, NOT v2 or v3 or v4
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x