Log Message:
shells/nushell: update to 0.43.0

What's New:
-You can now learn about some of the upcoming changes in Nushell by reading the
 tutor e-q page. It will tell you about some of the new features and breaking
 changes, as well as link you to the full list of changes.

Fixes:
-Fix to the sample configuration file
-Fix to a crate description
-Bump to some dependencies in wasm support
-Update to sysinfo support
-Fix to build on latest Rust stable + clippy