Drop 3.3 support for now

Author: marcqualie

.github/workflows/test.yml

@@ -16,7 +16,6 @@ jobs:
           - "3.0.6"
           - "3.1.4"
           - "3.2.3"
-          - "3.3.0"
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby