update 2023, java 20

build.gradle

@@ -16,8 +16,8 @@ ext {
     junitVersion = '5.8.2'
 }
 
-sourceCompatibility = '18'
-targetCompatibility = '18'
+sourceCompatibility = '20'
+targetCompatibility = '20'
 
 tasks.withType(JavaCompile) {
     options.encoding = 'UTF-8'
@@ -35,7 +35,7 @@ task runInConsole(type: JavaExec) {
 }
 
 javafx {
-    version = '18.0.1'
+    version = '20.0.2'
     modules = ['javafx.controls', 'javafx.fxml']
 }
 

gradle/wrapper/gradle-wrapper.properties

 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists