Remove python 3.6 check and fix ruby check

Reference: https://github.com/ruby/setup-ruby

For virtual environments we're currently using 3.7.10

Signed-off-by: chenwany <chenwany@amazon.com>

Author: chenwany

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Setup Ruby
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.7
       - name: Install dependencies
@@ -51,15 +51,11 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         name:
-          - Python 3.6 Tests
           - Python 3.7 Tests
           - Python 3.8 Tests
           - Python 3.9 Tests
           - Code Checks
         include:
-          - name: Python 3.6 Tests
-            python: 3.6
-            toxenv: py36
           - name: Python 3.7 Tests
             python: 3.7
             toxenv: py37

tox.ini

@@ -2,7 +2,7 @@
 toxworkdir=.tox
 skipsdist=True
 envlist =
-    py{36,37,38,39}
+    py{37,38,39}
     code-linters
 
 # Default testenv. Used to run tests on all python versions.