Removed 3.6 python version

https://github.com/kubernetes-client/python/actions/runs/3999583001/jobs/6863664535

Author: yliaog

.github/workflows/test.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.10"]
+        python-version: ["3.7", "3.8", "3.10"]
         include:
           - python-version: "3.9"
             use_coverage: 'coverage'