Start building against Spring WS 5.0.0-M1 snapshots

See gh-45873

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -2378,7 +2378,7 @@ bom {
 			releaseNotes("https://github.com/spring-projects/spring-session/releases/tag/{version}")
 		}
 	}
-	library("Spring WS", "4.1.0-SNAPSHOT") {
+	library("Spring WS", "5.0.0-SNAPSHOT") {
 		considerSnapshots()
 		group("org.springframework.ws") {
 			bom("spring-ws-bom")

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/webservices/template/MyService.kt

@@ -30,7 +30,7 @@ class MyService(webServiceTemplateBuilder: WebServiceTemplateBuilder) {
 		webServiceTemplate = webServiceTemplateBuilder.build()
 	}
 
-	fun someWsCall(detailsReq: SomeRequest?): SomeResponse {
+	fun someWsCall(detailsReq: SomeRequest): SomeResponse {
 		return webServiceTemplate.marshalSendAndReceive(
 			detailsReq,
 			SoapActionCallback("https://ws.example.com/action")