mail/postsrsd: Update 2.0.11 => 2.4.1

Changelog:
https://github.com/roehling/postsrsd/releases/tag/2.0.12
https://github.com/roehling/postsrsd/releases/tag/2.1.0
https://github.com/roehling/postsrsd/releases/tag/2.2.0
https://github.com/roehling/postsrsd/releases/tag/2.2.1
https://github.com/roehling/postsrsd/releases/tag/2.2.2
https://github.com/roehling/postsrsd/releases/tag/2.2.3
https://github.com/roehling/postsrsd/releases/tag/2.2.4
https://github.com/roehling/postsrsd/releases/tag/2.2.5
https://github.com/roehling/postsrsd/releases/tag/2.2.6
https://github.com/roehling/postsrsd/releases/tag/2.2.7
https://github.com/roehling/postsrsd/releases/tag/2.3.0
https://github.com/roehling/postsrsd/releases/tag/2.4.0
https://github.com/roehling/postsrsd/releases/tag/2.4.1

PR: 299414
Sponsored by: UNIS Labs (vvd, commit patch)
MFH: 2026Q4

(cherry picked from commit 6316fc2afe9b0485ee8a39b147ac2264ae1612f3)