Update Rust crate gtk to v0.8.2 - autoclosed

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gtk (source)	dependencies	patch	0.8.0 -> 0.8.2

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Release Notes

gtk-rs/gtk4-rs (gtk)

v0.8.2

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Bilal Elmoussaoui:

• gtk/subclass: Add IMContext.activate_osk_with_event vfunc support
• gdk: Add DmabufTextureBuilder::build
• gdk: Mark Texture builders destroy callbacks as Send
• Add gtk 4.15 unstable APIs support

Kévin Commaille:

• macros: Remove proc-macro-error dependency
• macros: Upgrade syn to 2.0
• macros: Drop anyhow dependency

Sebastian Dröge:

• Correctly handle NULL GError** out parameters

v0.8.1

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Bilal Elmoussaoui:

• Add more 4.14 APIs support
• Fix gtk::PopoverMenuFlags erroneously locked behind v4_14 feature flag
• Add a gnome-46 feature to gtk4 crate. See README for details

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