Client registration doesn't work when Spring Boot configured to use snake case

[obourgain]

Spring Boot Admin Server information

• Version:
  Spring Boot Admin server & client 3.4.5

• Spring Boot version:
  Spring Boot 3.4

• Configured Security:
  basic auth, but not relevant to this issue

• Webflux or Servlet application:
  servlet, but not relevant to this issue

Client information

• Spring Boot versions:
  Spring Boot 3.4

• Used discovery mechanism:
  self registration

• Webflux or Servlet application:
  servlet, but not relevant to this issue

Description

When the client app uses the property spring.jackson.property-naming-strategy: SNAKE_CASE, then the registration client will write the body for the registration request using snake case.
This can't be deserialized properly by RegistrationDeserializer as it supports only camel case.

I would expect Spring Boot Admin to not rely on the generic MessageConverters facility from Spring but instead configure explicitly the ObjectMapper.

## Reproducer

You can easily reproduce this issue with the test ClientServletApplicationTest by adding "--spring.jackson.property-naming-strategy=SNAKE_CASE" to the application.run(...)