Added Ruby 3.3 to Github action

Author: njh

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ['2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2']
+        ruby: ['2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3