Springdoc breaks (Unexpected value: TRACE) when a spring-cloud-starte…

…r-gateway-mvc universal gateway is configured. Fixes #2506

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/fn/RouterFunctionData.java

@@ -285,6 +285,7 @@ private RequestMethod getRequestMethod(HttpMethod httpMethod) {
 			case "PATCH" -> requestMethod = RequestMethod.PATCH;
 			case "HEAD" -> requestMethod = RequestMethod.HEAD;
 			case "OPTIONS" -> requestMethod = RequestMethod.OPTIONS;
+			case "TRACE" -> requestMethod = RequestMethod.TRACE;
 			default ->
 					throw new IllegalStateException("Unexpected value: " + httpMethod.name());
 		}