Test TruffleRuby release in CI for improved stability

Author: eregon

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, 3.4, ruby-head, truffleruby-head ]
+        ruby: [ 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, 3.4, ruby-head, truffleruby ]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6