Bump gdk4 from 0.9.2 to 0.9.3

[dependabot[bot]]

Bumps gdk4 from 0.9.2 to 0.9.3.

Release notes

Sourced from gdk4's releases.

0.9.3

Bilal Elmoussaoui:

• Add GTK 4.16 color types support

Fina:

• Fix glib::Properties support for TemplateChild
• Add support for subclassing gtk::AccessibleText

Commits

• See full diff in compare view

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[dependabot[bot]]

Looks like gdk4 is up-to-date now, so this is no longer needed.