update the blake3 dependency to v1

[oconnor663]

The blake3 crate currently has a MSRV of 1.51 for const generics.

[sylvestre]

The ci fails with

    Updating crates.io index
error: the lock file /home/runner/work/sccache/sccache/Cargo.lock needs to be updated but --locked was passed to prevent this
If you want to try to generate the lock file without accessing the network, use the --offline flag.
Error: Process completed with exit code 101.

[oconnor663]

Thanks, added the lockfile changes and force pushed.

[oconnor663]

Ah it looks like there are some CI runs that test rustc 1.43. This PR will have to wait until it's ok to bump the MSRV.

[mitchhentges]

Hey, thanks for the patch!
I'm going to close this because we're going to do a larger update-bump pass, which is also contingent on us having a more concrete understanding of the restrictions on having the MSRV bumped.