Update ci.yml

Author: ponnhide

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.11]
     steps:
       - name: Checkout
         uses: actions/checkout@v3