Bump gdk4 from 0.8.1 to 0.8.2

[dependabot[bot]]

Bumps gdk4 from 0.8.1 to 0.8.2.

Release notes

Sourced from gdk4's releases.

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

Commits

• cf84b5c Bump version to 0.8.2
• d92caf7 Allow deprecated types
• 7a987a7 gdk: Manually implement Cursor.new_from_callback
• 85e6727 gtk: Don't generate duplicate getter/setter for GraphicsOffload
• d54b3d2 Expose the new v4_16 feature
• c970673 gtk: Generate FontRendering
• 9b54be4 Update system deps requirements
• c15e799 Regenerate with latest gir/gir-files
• aad0bea Update gir/gir-files submodules
• d26a764 macros: Drop anyhow dependency
• Additional commits viewable in compare view

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