There is no cargo command to update the crates.io index, but it automatically triggers
when there is any Cargo operation interacting with the registry.

Implement as a poor man solution the method suggested by Juan Campa.

References:

• https://github.com/rust-lang/cargo/issues/3377
• https://stackoverflow.com/questions/63748045/how-to-update-crate-registry-index-using-cargo

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