Build only on jdk 17

Author: sgdc3

.github/workflows/maven.yml

@@ -6,7 +6,7 @@ jobs:
   build_and_test:
     strategy:
       matrix:
-        jdkversion: [8, 11, 17]
+        jdkversion: [17]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3