Build failing -- old version of cargo

[swcurran]

The build flow is failing because of an old version of cargo. Log follows.

@andrewwhitehead -- should we just archive the indy-bls repos? AFAIK they are not being used -- as this error suggests.

error: failed to compile `cross v0.2.4 (https://github.com/rust-embedded/cross?tag=v0.2.4#4645d937)`, intermediate artifacts can be found at `/tmp/cargo-installUSamss`

Caused by:
  failed to download replaced source registry `crates-io`

Caused by:
  failed to parse manifest at `/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/home-0.5.12/Cargo.toml`

Caused by:
  failed to parse the `edition` key

Caused by:
  this version of Cargo is older than the `2024` edition, and only supports `2015`, `2018`, and `2021` editions.
Error: Process completed with exit code 101.