Update Rust crate gdk to ^0.8.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gdk (source)	dependencies	patch	^0.8.1 -> ^0.8.2

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Release Notes

gtk-rs/gtk4-rs (gdk)

### [`v0.8.2`](https://togithub.com/gtk-rs/gtk4-rs/releases/tag/0.8.2) [Compare Source](https://togithub.com/gtk-rs/gtk4-rs/compare/0.8.1...0.8.2) 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

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