Update gradle.yml

Update latest build version to Java 24.

Author: jenetics

.github/workflows/gradle.yml

@@ -17,7 +17,7 @@ jobs:
         strategy:
             matrix:
                 os: [ ubuntu-latest, macos-latest ]
-                java-version: [ 21, 23  ]
+                java-version: [ 21, 24  ]
         steps:
             - uses: actions/checkout@v2
 
@@ -27,4 +27,4 @@ jobs:
                   java-version: ${{ matrix.java-version }}
                   distribution: 'zulu'
             - name: Build with Gradle
-              run: ./gradlew build --stacktrace --info
+              run: ./gradlew build --stacktrace --info