Ensure RestClientResponseException is serializable

Closes gh-30224

Author: rstoyanchev

spring-web/src/main/java/org/springframework/web/client/RestClientResponseException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -54,8 +54,7 @@ public class RestClientResponseException extends RestClientException {
 	private final String responseCharset;
 
 	@Nullable
-	@SuppressWarnings("serial")
-	private Function<ResolvableType, ?> bodyConvertFunction;
+	private transient Function<ResolvableType, ?> bodyConvertFunction;
 
 
 	/**

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClientResponseException.java

@@ -58,7 +58,6 @@ public class WebClientResponseException extends WebClientException {
 	@Nullable
 	private transient final HttpRequest request;
 
-	@SuppressWarnings("MutableException")
 	@Nullable
 	private transient Function<ResolvableType, ?> bodyDecodeFunction;