Update tests.yml

bump python version from 3.7 to 3.9.2

.github/workflows/tests.yml

@@ -9,10 +9,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Set up Python 3.7
+    - name: Set up Python 3.9.2
       uses: actions/setup-python@v1
       with:
-        python-version: 3.7
+        python-version: 3.9.2
 
     - name: Clone repo
       run: |