multimedia/pHash: Deprecate and set expiration date to 2023-04-09

No users left in tree and fails to build with FFmpeg 6.0
Proposed soft deadline for FFMpeg 6.0 switch is one week after branching
of 2023Q2 so keep port around until branching.

PR: 270296
Reviewed by: Naram Qashat <cyberbotx@cyberbotx.com> (maintainer)