Deprecate `MediaType.APPLICATION_JSON_UTF_8`

[sbrannen]

Overview

Since the industry considers UTF-8 to be the implicit default encoding for the application/json media type, we should deprecate MediaType.APPLICATION_JSON_UTF_8 in favor of MediaType.APPLICATION_JSON.

Related Issues

• Deprecate MediaType.APPLICATION_JSON_UTF8 in favor of APPLICATION_JSON spring-projects/spring-framework#22788