Remove @Lazy injection for HttpMessageConverters

This commit turns a lazy injection point for `HttpMessageConverters`
into an `ObjectProvider`-backed injection.

This allows to lazily rely on that bean without creating for it; in some
environments, such proxy creation can lead to issues like SPR-16990.

See gh-13785

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.java

@@ -62,7 +62,6 @@ import org.springframework.context.ResourceLoaderAware;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
-import org.springframework.context.annotation.Lazy;
 import org.springframework.context.annotation.Primary;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
@@ -180,7 +179,7 @@ public class WebMvcAutoConfiguration {
 
 		private final ListableBeanFactory beanFactory;
 
-		private final HttpMessageConverters messageConverters;
+		private final ObjectProvider<HttpMessageConverters> messageConvertersProvider;
 
 		final ResourceHandlerRegistrationCustomizer resourceHandlerRegistrationCustomizer;
 
@@ -188,12 +187,12 @@ public class WebMvcAutoConfiguration {
 
 		public WebMvcAutoConfigurationAdapter(ResourceProperties resourceProperties,
 				WebMvcProperties mvcProperties, ListableBeanFactory beanFactory,
-				@Lazy HttpMessageConverters messageConverters,
+				ObjectProvider<HttpMessageConverters> messageConvertersProvider,
 				ObjectProvider<ResourceHandlerRegistrationCustomizer> resourceHandlerRegistrationCustomizerProvider) {
 			this.resourceProperties = resourceProperties;
 			this.mvcProperties = mvcProperties;
 			this.beanFactory = beanFactory;
-			this.messageConverters = messageConverters;
+			this.messageConvertersProvider = messageConvertersProvider;
 			this.resourceHandlerRegistrationCustomizer = resourceHandlerRegistrationCustomizerProvider
 					.getIfAvailable();
 		}
@@ -205,7 +204,8 @@ public class WebMvcAutoConfiguration {
 
 		@Override
 		public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
-			converters.addAll(this.messageConverters.getConverters());
+			this.messageConvertersProvider.ifAvailable((customConverters) -> converters
+					.addAll(customConverters.getConverters()));
 		}
 
 		@Override