Add GH CI Java 26

Bump GH CI from Java 26-ea to 27-ea

Author: garydgregory

.github/workflows/maven.yml

@@ -34,7 +34,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        java: [ 8, 11, 17, 21, 25, 36 ]
+        java: [ 8, 11, 17, 21, 25, 26 ]
         experimental: [false]
         # Keep the same parameter order as the matrix above
         include: