Test current pytest.

Author: sallner

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
             "5.3.5",
             "5.4.3",
             "6.0.2",
-            "6.1.0",
+            "6.1.1",
         ]
     steps:
       - uses: actions/checkout@v2