Set jvm target for kotlin to jvm11 to match java.

Author: rlazo

buildSrc/build.gradle.kts

@@ -106,3 +106,9 @@ tasks.withType<Test> {
     val enablePluginTests: String? by rootProject
     enabled = enablePluginTests == "true"
 }
+-
+tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+}