Merge pull request #2355 from return42/drop-py37

[CI] drop Python 3.7 from CI

.github/workflows/integration.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-20.04]
-        python-version:  ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version:  ["3.8", "3.9", "3.10", "3.11"]
     steps:
     - name: Checkout
       uses: actions/checkout@v2