Revert actions/checkout version

Author: kabilar

.github/workflows/build-docs.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v1
 
       - name: Install version of Python
         uses: actions/setup-python@v5