Bump pytest-asyncio version (#6086)

And change GH Actions build workflow python version for MacOS

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
         python: ['3.7', '3.8', '3.9', '3.10', '3.11']
         include:
           - os: 'macos-latest'
-            python: '3.7'
+            python: '3.8'
     steps:
       - name: Checkout
         uses: actions/checkout@v3

.github/workflows/test_fast.yml

@@ -24,7 +24,7 @@ jobs:
         include:
           # mac os test
           - os: 'macos-11'
-            python-version: '3.7'  # oldest supported version
+            python-version: '3.8'  # oldest supported version
           # non-utc timezone test
           - os: 'ubuntu-latest'
             python-version: '3.9'  # not the oldest, not the most recent version

setup.cfg

@@ -117,7 +117,7 @@ tests =
     flake8>=3.0.0
     mypy>=0.910,<1.9
     # https://github.com/pytest-dev/pytest-asyncio/issues/706
-    pytest-asyncio>=0.17,!=0.23.*
+    pytest-asyncio>=0.21.2,!=0.23.*
     pytest-cov>=2.8.0
     pytest-xdist>=2
     pytest-env>=0.6.2