Update unit-tests.yml

[skip-ci]

Author: pablormier

.github/workflows/unit-tests.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9, 3.10]
 
     steps:
     - uses: actions/checkout@v2