Update test.yml

Author: andy-landy

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: [3.8]
     steps:
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v1