Fix Kotlin warnings

spring-webflux/src/test/kotlin/org/springframework/web/reactive/function/server/RouterFunctionExtensionsTests.kt

@@ -133,8 +133,10 @@ class RouterFunctionExtensionsTests {
 			path("/baz") { handle(req) }
 		}
 
+		@Suppress("UNUSED_PARAMETER")
 		fun handleFromClass(req: ServerRequest) = ok().build()
 	}
 }
 
+@Suppress("UNUSED_PARAMETER")
 fun handle(req: ServerRequest) = ok().build()

spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/view/script/ScriptTemplateWithBindingsExtensions.kt

@@ -1,3 +1,5 @@
+@file:Suppress("UNCHECKED_CAST")
+
 package org.springframework.web.reactive.result.view.script
 
 import kotlin.script.templates.standard.ScriptTemplateWithBindings