Use Java 17 compatibility in all projects

Author: marcphilipp

junit-jupiter-starter-gradle-kotlin/build.gradle.kts

@@ -23,7 +23,7 @@ tasks.test {
 }
 
 tasks.withType<JavaCompile>().configureEach {
-	options.release.set(17)
+	options.release = 17
 }
 
 tasks.withType<KotlinCompile>().configureEach {

junit-multiple-engines/build.gradle.kts

@@ -1,4 +1,4 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_1_8
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
@@ -84,11 +84,11 @@ dependencies {
 tasks {
 
     withType<JavaCompile>().configureEach {
-        options.release.set(8)
+        options.release = 17
     }
 
     withType<KotlinCompile>().configureEach {
-        compilerOptions.jvmTarget = JVM_1_8
+        compilerOptions.jvmTarget = JVM_17
     }
 
     val consoleLauncherTest by registering(JavaExec::class) {

junit-multiple-engines/buildSrc/build.gradle.kts

@@ -1,4 +1,4 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_11
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
 
 plugins {
     `kotlin-dsl`
@@ -10,9 +10,9 @@ repositories {
 
 tasks {
     compileKotlin {
-        compilerOptions.jvmTarget = JVM_11
+        compilerOptions.jvmTarget = JVM_17
     }
     compileJava {
-        options.release.set(11)
+        options.release = 17
     }
 }