#52 updates github build configuration

Author: Dennis Sheirer

.github/workflows/gradle.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v2
         with:
-          java-version: '17'
+          java-version: '19'
           distribution: 'liberica'
           java-package: 'jdk+fx'
       - name: Build with Gradle