fix: update GTK and WebKit dependencies to version 4 and 6.0

[amemya]

依存関係によってCIが走らない問題を解決

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[Copilot]

Pull request overview

Updates the Linux build dependencies in the release GitHub Actions workflow to newer GTK/WebKit development packages, aiming to resolve CI failures caused by missing system dependencies.

Changes:

• Switch Linux apt dependencies from GTK3/WebKit2GTK to GTK4/WebKitGTK 6.0 in the release workflow.

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