Suport new fingerprint format.

[Eh2406]

Cargo just merged a new fingerprint format in rust-lang/cargo#8210 (look for Fingerprint changes) We should make shure we are compatible with both the old and the new formats.

[holmgr]

Sounds reasonable, maybe this is a good opportunity to add some higher level tests, to ensure that we defend against regressions on both new and old formats

[aminya]

Is this still an issue? When I use cargo-sweep, it removes the files generated by the rust-analyzer. Not sure if it is related to this

[jyn514]

I think this has been fixed, yeah.