converters/wkhtmltopdf: Mark BROKEN on 14

• Fails to build with: use of undeclared identifier 'needsToUnregister' Have treid to build with llvm14 and llvm15 with the same result
• Mark DEPRECATED as upstream has abandoned the project. See for more information: https://wkhtmltopdf.org/status.html
• Consider print/py-weasyprint as a replacemnent
• Set EXPIRATION_DATE to 2024-06-30 expecting that we will have llvm16 on 13.3 and 13.3 will be released around mid of 2024

Approved by: portmgr (blanket)
Sponsored by: The FreeBSD Foundation