build(deps): update gtk4 requirement from 0.6.6 to 0.9.6

[dependabot]

Updates the requirements on gtk4 to permit the latest version.

Release notes

Sourced from gtk4's releases.

0.9.6

Bilal Elmoussaoui:
      Ignore manual_c_str_literals clippy warning
      book: Fix typo
      ci:  Use cairo as a renderer
      Update dependencies
      Export v4.18 feature
      Ignore unused imports warning on auto code
      gdk-wayland: Export auto traits on prelude
      Update dependencies
Sebastian Dröge:
Update gir / gir-files
Regenerate with latest gir / gir-files
Update versions to 0.9.6
Zander Brown:
gtk: don't leak snapshots

Changelog

Sourced from gtk4's changelog.

Change Log

[Unreleased]

[0.6.6]

Bilal Elmoussaoui:

• gtk: Implement convenience traits for StringObject
• gtk: Move gtk::StyleContext::add_provider_for_display & gtk::StyleContext::remove_provider_for_display functions outside of gtk::StyleContext type as it was deprecated in GTK 4.10 causing a wrong deprecation warning. Switch to gtk::style_context_add_provider_for_display & gtk::style_context_remove_provider_for_display instead.

Yuri Izmer:

• gtk4-macros: Extend blueprint support to files

#[derive(Debug, Default, gtk::CompositeTemplate)]
#[template(file = "src/my_widget.blp")] // relative to the project directory
pub struct MyWidget {
    #[template_child]
    pub label: TemplateChild<gtk::Label>,
    #[template_child(id = "my_label2")]
    pub label2: gtk::TemplateChild<gtk::Label>,
}

[0.6.5]

Fabio Valentini:

• gtk4-macros: enable default features of syn

[0.6.4]

Bilal Elmoussaoui:

• gtk: Add missing guard to AccessibleRoleToggleButton

[0.6.3]

Bilal Elmoussaoui:

• gtk/subclass: Adapt per Accessible transfer type changes
• Bump GTK requirement for v4_10 feature
• Fix nightly clippy warnings
• Fix docs generation

Maximiliano Sandoval R:

... (truncated)

Commits

• 20d14bd Update versions to 0.9.6
• c60713b Merge pull request #1976 from sdroege/0.9-backports
• 1c1db77 Update dependencies
• 0e04cca gdk-wayland: Export auto traits on prelude
• 8b32fbf Ignore unused imports warning on auto code
• 5281fc6 Export v4.18 feature
• 6e54bc6 Update dependencies
• d36d1c5 Regenerate with latest gir / gir-files
• 1c439c1 Update gir / gir-files
• 0ad3de6 ci: Use cairo as a renderer
• Additional commits viewable in compare view

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