Override indra settings to Java 17

bootstrap/viaproxy/build.gradle.kts

@@ -3,6 +3,12 @@ java {
     sourceCompatibility = JavaVersion.VERSION_17
 }
 
+indra {
+    javaVersions {
+        target(17)
+    }
+}
+
 dependencies {
     api(projects.core)
 }