Fix WebSocket CORS configs for trailing slashes

Related to https://github.com/spring-projects/spring-framework/issues/26892

The WebSocket tests with `allowedOrigins` fail now because CORS processor
in Spring Framework removes a trailing slash from the request where possible one
in the config is left as is.

* Remove the trailing slash from the CORS config to match the current SF behavior

spring-integration-stomp/src/test/java/org/springframework/integration/stomp/inbound/StompInboundChannelAdapterWebSocketIntegrationTests.java

@@ -318,7 +318,7 @@ public class StompInboundChannelAdapterWebSocketIntegrationTests {
 		public void registerStompEndpoints(StompEndpointRegistry registry) {
 			registry.addEndpoint("/ws")
 					.setHandshakeHandler(handshakeHandler())
-					.setAllowedOrigins("https://www.example.com/")
+					.setAllowedOrigins("https://www.example.com")
 					.addInterceptors(new HandshakeInterceptor() {
 
 						@Override

spring-integration-websocket/src/test/java/org/springframework/integration/websocket/server/WebSocketServerTests.java

@@ -263,7 +263,7 @@ public class WebSocketServerTests {
 			return new ServerWebSocketContainer("/ws")
 					.setHandshakeHandler(handshakeHandler())
 					.setDecoratorFactories(testWebSocketHandlerDecoratorFactory())
-					.setAllowedOrigins("https://www.example.com/")
+					.setAllowedOrigins("https://www.example.com")
 					.withSockJs();
 		}