Delete python version 3.7.x from test

Author: whu-lyft

.github/workflows/pull_request.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ['3.7.x', '3.8.x', '3.9.x', '3.10.x', '3.11.x']
+        python-version: ['3.8.x', '3.9.x', '3.10.x', '3.11.x']
     steps:
       - name: Checkout
         uses: actions/checkout@v1