Update `relm4` and `gtk4` to newer versions #659

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Run time

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Job	Run time
cargo-fmt	54s
cargo-clippy (ubuntu-24.04)	6m 13s
cargo-test (ubuntu-24.04)	10m 48s
cargo-clippy (macos-14)	5m 46s
cargo-test (macos-14)	9m 38s
cargo-clippy (windows-2022)	15m 8s
cargo-test (windows-2022)	23m 14s
	1h 11m 41s