ci: disable test for python 3.6 (#823)

Author: naveen521kk

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python: [3.6, 3.7, 3.8, 3.9]
+        python: [3.7, 3.8, 3.9]
 
     steps:
       - name: Checkout the repository