Use TruffleRuby 23.1.2 in CI

Author: PetrHeinz

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
           - "2.5"
           - "jruby-9.4.3.0"
           - "jruby-9.2.14.0"
-          - "truffleruby-23.0.0"
+          - "truffleruby-23.1.2"
           - "truffleruby-22.1.0"
 
     steps: