mail/mime4j: Mark DEPRECATED

This version has multiple vulnerabilities.
The latest version is 0.8.14.

https://www.cve.org/CVERecord?id=CVE-2024-21742
https://www.cve.org/CVERecord?id=CVE-2022-45787

PR: 295358
Approved by: ale (maintainer)
Approved by: osa (mentor)