Fix IFD git dependency package ID format discrepancy with recent cargo versions

[landaudiogo]

As described in PR and PR, crate2nix assumes a package ID format that is only compatible with older versions of cargo.

This PR changes tools.nix to write the package ids to crate-hashes.json in the same format as the version of cargo available to crate2nix fixing the observed discrepancy. I have created a repository which motivates the problem, and shows how the proposed fix solves it.

[domenkozar]

Looks like CI is saying you need to format your changes.

[landaudiogo]

Thanks! Just added the commit that formats the PR