[BUG] [java] deprecated call to RequestBody.create (OAuthOkHttpClient)

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Generated OAuthOkHttpClient.java has a deprecated call to RequestBody.create() (parameter reorder).

openapi-generator version

6.6.0 (Latest Version Tested)

Steps to reproduce

Generate a set of Java API Calls using a .yaml file.

Actual Results: The OAuthOkHttpClient class has a deprecated call to RequestBody.create
Expected Results: The OAuthOkHttpClient class should use the non deprecated call to RequestBody.create

Related issues/PRs

#13778 covers the same issue for a different generated class.

Suggest a fix

I'm assuming that this will be the same or a similar fix as was done in commit 9e5c919560b182a348fc4ffabcda01d7d3f97f26

Start by locating the template or source that generates OAuthOkHttpClient.java and compare the deprecated RequestBody.create call with the fix described in issue #13778 and commit 9e5c919560b182a348fc4ffabcda01d7d3f97f26. Regenerate a Java client from a YAML spec and verify that OAuthOkHttpClient uses the non-deprecated call.