github actions: exclude matrix containing an upstream bug

.github/workflows/tests.yaml

@@ -22,6 +22,11 @@ jobs:
         - aiohttp
         - tornado
         - httpx[http2]>=0.14.0
+        exclude:
+        # Python 3.7 has a bug with openssl 3.x: https://bugs.python.org/issue43788
+        # https://github.com/lilydjwg/nvchecker/actions/runs/4524633969/jobs/7968599431
+        - python-version: "3.7"
+          deps: tornado
     steps:
     - name: Checkout code
       uses: actions/checkout@v3