linux: Fix panic handling unknown keys (#14274)

Pulls in https://github.com/rust-x-bindings/xkbcommon-rs/pull/54 to
avoid
panicking.

Release Notes:

- linux: Fix a panic in keyboard handling
adf74fdc14Conrad Irwin committed on 7/11/2024, 11:03:19 PM· committed by GitHubparente402d7e
2 files changedLine totals unavailable