sysutils/libudisks: Update to 2.9.4

• consult portclippy
• switch MAINTAINER to my @f.o address
• use %%PORTVERSION%% in pkg-plist to avoid changing it on each upstream upgrade

ChangeLog:
https://github.com/storaged-project/udisks/blob/udisks-2.9.4/NEWS

PR: 267263
MFH: 2022Q4 (bugfixes)
(cherry picked from commit 4b8953300ff9a327ad32a6d80fc3b8abcb6f603b)