Update ci.yml to fix error (#344)

Author: auvipy

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v3