fix: build error on linux due to tauri-plugin-context-menu

[thisislvca]

This PR fixes the following error when compiling tauri-plugin-context-menu on linux as discussed over on Discord: error[E0433]: failed to resolve: use of undeclared crate or module 'os'

Extended error:

error[E0433]: failed to resolve: use of undeclared crate or module `os`
  --> /home/luca/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tauri-plugin-context-menu-0.5.0/src/lib.rs:60:9
   |
60 |         os::show_context_menu(context_menu, window, pos, items);
   |         ^^ use of undeclared crate or module `os`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `tauri-plugin-context-menu` (lib) due to previous error

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