Updated examples (Kotlin 1.5.31, JDK 1.8)

examples/build.gradle.kts

@@ -1,7 +1,9 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
     id("application")
     id("com.github.ben-manes.versions") version "0.39.0"
-    kotlin("jvm") version "1.5.21"
+    kotlin("jvm") version "1.5.31"
 }
 
 // ./gradlew run --args='https://erik.thauvin.net/ https://bit.ly/2PsNMAA'
@@ -22,7 +24,16 @@ application {
     mainClass.set("com.example.BitlyExampleKt")
 }
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
+
 tasks {
+    withType<KotlinCompile>().configureEach {
+        kotlinOptions.jvmTarget = java.targetCompatibility.toString()
+    }
+
     register("runJava", JavaExec::class) {
         group = "application"
         mainClass.set("com.example.BitlySample")