update rust dependency

[BenWhiteJam]

If there are certain version dependencies then these should be taken care of

error: failed to compile `pop-cli v0.1.0 (https://github.com/r0gue-io/pop-cli#7dc2e5dd)`, intermediate artifacts can be found at `/var/folders/_0/x9pp72wj13551p5tqynmrmpr0000gn/T/cargo-installf10s9A`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.

Caused by:
  package `subxt-metadata v0.34.0` cannot be built because it requires rustc 1.74.0 or newer, while the currently active rustc version is 1.72.0
  Either upgrade to rustc 1.74.0 or newer, or use
  cargo update -p [email protected] --precise ver
  where `ver` is the latest version of `subxt-metadata` supporting rustc 1.72.0

[weezy20]

Hi @BenWhiteJam. Thanks for your interest in pop-cli and thanks for contributing. We found a better way that will automate this process for users without having to run rustup update. You can find it here #73. Meanwhile, we are checking if cargo install --git respects this solution. If it does, we go with #73, otherwise we include your tip in the readme. Please feel free to raise other issues/contributions if you find something of concern.

[weezy20]

Okay so we confirmed that #73 works with cargo install --git as well. Closing this in favour of that. Thanks again for bringing this to our attention @BenWhiteJam