Add HttpMethod reflection hint to ObjectToObjectConverterRuntimeHints

This commit adds a reflection hint for HttpMethod#valueOf in order
to be able to support conversion required for Spring Boot
configuration properties binding as described in
https://github.com/spring-projects/spring-boot/issues/34483.

Closes gh-30201

spring-core/src/main/java/org/springframework/aot/hint/support/ObjectToObjectConverterRuntimeHints.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.
@@ -43,6 +43,9 @@ class ObjectToObjectConverterRuntimeHints implements RuntimeHintsRegistrar {
 				.onReachableType(sqlDateTypeReference)
 				.withMethod("valueOf", List.of(TypeReference.of(LocalDate.class)), ExecutableMode.INVOKE)
 				.onReachableType(sqlDateTypeReference));
+
+		hints.reflection().registerTypeIfPresent(classLoader, "org.springframework.http.HttpMethod",
+				builder -> builder.withMethod("valueOf", List.of(TypeReference.of(String.class)), ExecutableMode.INVOKE));
 	}
 
 }