upgrade prototype test CI from 3.7 to 3.10

.circleci/config.yml.in

@@ -359,7 +359,7 @@ jobs:
 
   unittest_prototype:
     docker:
-      - image: cimg/python:3.7
+      - image: cimg/python:3.8
     resource_class: xlarge
     steps:
       - checkout

test/test_prototype_builtin_datasets.py

@@ -41,6 +41,7 @@ def test_coverage():
         )
 
 
+# @pytest.mark.filterwarnings("ignore::ResourceWarning")
 @pytest.mark.filterwarnings("error")
 class TestCommon:
     @pytest.mark.parametrize("name", datasets.list_datasets())