xfce4-notifyd: update to 0.9.2

systemd support is not enabled for pkgsrc purposes (effectively not
supported), so some of these changes are not relevant.

Change log:

0.9.2 (2023-09-24)
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- (Hopefully) actually fix settings migration code
- (Hopefully) fix enum setting migration code

0.9.1 (2023-09-19)
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- Make the XDG autostart file attempt a systemd start first
- Only include the SystemdService= line if systemd support is enabled
- Clean up some conditionals in configure.ac
- Go back to installing the XDG autostart file by default
- Allow installing systemd service file even if systemd is not installed

(gutteridge)