www/ttf2eot: Deprecate and set expiration date to 2022-09-30

Obsolete font format that's been suprseded by OTF/TTF/WOFF/WOFF2
Last known major browser to support this format is Internet Explorer 11
which is unsupported since June 15, 2022.

Reference:
https://blogs.windows.com/windowsexperience/2021/05/19/the-future-of-internet-explorer-on-windows-10-is-in-microsoft-edge/

PR: 263910
Reviewed by: Chris Hutchinson <portmaster@bsdforge.com> (maintainer)