Bug#992980: gnome-shell complains if using lightdm

[Grand T]

Hello,
After this update

```
Réception de :15 https://cdn-aws.deb.debian.org/debian bookworm/main amd64 gnome-shell amd64 3.38.6-1 [829 kB] Réception de :16 https://cdn-aws.deb.debian.org/debian bookworm/main amd64 gnome-shell-common all 3.38.6-1 [744 kB]
```
The notification is no more displayed.


https://metadata.ftp-master.debian.org/changelogs/main/g/gnome-shell/gnome-shell_3.38.6-1_changelog

  *   Make sure to return a value from D-Bus methods so callers won’t
time out

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