remove 3.7 from tests

Author: daniel-sanche

.github/workflows/unittest.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ['3.7', '3.8']
+        python: ['3.8']
     steps:
     - name: Checkout
       uses: actions/checkout@v4