net/self-service-password: Update to 1.4.5

ChangeLog:
https://github.com/ltb-project/self-service-password/releases/tag/v1.4.5

v1.4.3[1] included security fixes.

[1] https://github.com/ltb-project/self-service-password/releases/tag/v1.4.3

PR: 265141
Reported by: geraud@gcu.info
Approved by: ports@bsdserwis.com (maintainer)
MFH: 2022Q3 (bugfixes, including security fixes)

(cherry picked from commit c0143e06173e06d1712532046179e794b8627744)