CI: Remove Python 3.7 from testing

Author: mgxd

.github/workflows/pytest.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ['3.8', '3.9', '3.10']
 
     steps:
     - name: Set up Python ${{ matrix.python-version }}