KTailctl v0.21.3

Resolves an issue in other environments than KDE Plasma where KTailctl would not correctly minimize to the tray icon when the window is closed.
Updates some dependencies to their latest versions.

Fixes

• Do not exit when tray icon is enabled and window is closed (if not in KDE Plasma)

Chores

Go:

• Update golang.org/x/net from v0.44.0 to v0.46.0
• Update tailscale.com from v1.86.5 to v1.88.3

Others:

• Update kirigami-addons from 1.9.0 to 1.10.0
• Update Python docker tag from 3.13 to 3.14