Use sparse protocol for crates.io
Makes builds a bit faster since flatpak sometimes updates the crates.io index more often than needed.
More info: https://doc.rust-lang.org/nightly/cargo/reference/registries.html#registry-protocols
Makes builds a bit faster since flatpak sometimes updates the crates.io index more often than needed.
More info: https://doc.rust-lang.org/nightly/cargo/reference/registries.html#registry-protocols