TST: Try checkout v1, see actions/checkout#334 [ci skip]

Author: pllim

.github/workflows/ci_workflows.yml

@@ -115,8 +115,9 @@ jobs:
     container:
       image: quay.io/pypa/manylinux1_i686
     steps:
+    # TODO: Use newer checkout actions when https://github.com/actions/checkout/issues/334 fixed
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v1
       with:
         fetch-depth: 0
     - name: Write configuration items to standard location to make sure they are ignored in parallel mode