Remove head versions from tests

Author: dejan

.github/workflows/test.yml

@@ -13,9 +13,7 @@ jobs:
           - '3.1'
           - '3.2'
           - '3.3'
-          - head
           - truffleruby
-          - truffleruby-head
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4