Add Ruby 3.3 to the testing matrix

Author: tokengeek

.github/workflows/ruby.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "head"]
+        ruby-version: ["2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "head"]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby