build: another pip-cache failure

Author: nedbat

.github/workflows/coverage.yml

@@ -96,8 +96,8 @@ jobs:
         uses: "actions/setup-python@v2"
         with:
           python-version: "3.8"
-          cache: pip
-          cache-dependency-path: 'requirements/*.pip'
+          #cache: pip
+          #cache-dependency-path: 'requirements/*.pip'
 
       - name: "Install dependencies"
         run: |