also test against JDK 26

Signed-off-by: Manfred Hanke <Manfred.Hanke@tngtech.com>

Author: hankem

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java-version: [8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]
+        java-version: [8, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]
     steps:
       - name: Checkout
         uses: actions/checkout@v6