Swapping python 3.6 for 3.5

So as to avoid build error for tests

Author: ramav87

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       max-parallel: 5
       matrix:
-        python-version: [3.9, 3.5]
+        python-version: [3.9, 3.6]
 
     steps:
     - uses: actions/checkout@v2