accessibility/redshift: Deprecate and set expiration date to 2024-06-30

No upstream activity for the past 4 years, a lot of bug reports upstream
and doesn't support wayland. Redirect users to accessibility/sct and there's
also https://gitlab.com/chinstrap/gammastep (not ported).

PR: 276954
Approved by: portmgr (maintainer timeout, 3+ months)