security/sudo: Update to 1.9.15p4

Major changes between sudo 1.9.15p4 and 1.9.15p3:

• Fixed a bug introduced in sudo 1.9.15 that could prevent a user's privileges from being listed by "sudo -l" if the sudoers entry in /etc/nsswitch.conf contains "[SUCCESS=return]". This did not affect the ability to run commands via sudo. Bug #1063.

PR: 275788
Approved by: garga (maintainer)
MFH: 2023Q4