CI: Remove Python 3.9 workflow (#88)

Author: arrowd

.github/workflows/test.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9,3.11]
+        python-version: [3.11]
 
     steps:
     - uses: actions/checkout@v2