The Java 23 build is no longer experimental

Author: garydgregory

.github/workflows/maven.yml

@@ -49,13 +49,13 @@ jobs:
           # Experimental builds: Java 23
           - os: ubuntu-latest
             java: 23
-            experimental: true
+            experimental: false
           - os: windows-latest
             java: 23
-            experimental: true
+            experimental: false
           - os: macos-latest
             java: 23
-            experimental: true
+            experimental: false
           # Experimental builds: Java 24-ea
           - os: ubuntu-latest
             java: 24-ea