ci: test Python 3.9 and 3.10 too

Signed-off-by: Unai Martinez-Corral <umartinezcorral@antmicro.com>

Author: umarcor

.github/workflows/ci.yml

@@ -9,7 +9,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.6, 3.7, 3.8]
+        python-version:
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+          - 3.10
 
     steps:
     - uses: actions/checkout@v2