fix: convert media type with charset

[bomgar]

charset caused issues with conversion

Description

Converting a MediaType with a charset throws an Exception

java.lang.IllegalArgumentException: MIME type may not contain reserved characters

	at org.apache.hc.core5.util.Args.check(Args.java:41)
	at org.apache.hc.core5.http.ContentType.create(ContentType.java:315)
	at org.apache.hc.core5.http.ContentType.create(ContentType.java:327)

Motivation and Context

We used text/xml;charset=UTF-8 as header and the client did not send the request.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[fatroom]

@bomgar please make sure that your commits has verified signature. check the GH documentation on setting it up: https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification

[bomgar]

@fatroom I signed the commit