fix(webflux): exception handling

Author: visheshupadhyay

spring-boot-starter/spring-boot-starter-webflux/src/main/java/com/getyourguide/openapi/validation/filter/decorator/BodyCachingServerHttpResponseDecorator.java

@@ -47,9 +47,14 @@ public Mono<Void> writeWith(@NonNull Publisher<? extends DataBuffer> body) {
         }
 
         var buffer = DataBufferUtils.join(body).doOnNext(dataBuffer -> {
-            cachedBody = dataBuffer.toString(StandardCharsets.UTF_8);
-            if (onBodyCachedListener != null) {
-                onBodyCachedListener.run();
+            try {
+                cachedBody = dataBuffer.toString(StandardCharsets.UTF_8);
+                if (onBodyCachedListener != null) {
+                    onBodyCachedListener.run();
+                }
+            } catch (RuntimeException exception) {
+                DataBufferUtils.release(dataBuffer);
+                throw exception;
             }
         });
         return super.writeWith(buffer);