Those were not installing Rust but configuring it via rustup, and
those configurations were done on `stable` toolchain which is not what we use (see rust-toolchain.toml)
co-authored-by: Piotr <piotr@zed.dev>
**This PR also bumps wasmtime version from 0.38 to 2.0 as 0.38 does not
build with Rust 1.75**. I did not test the plugin runtime as (AFAIK) we
intend to deprecate it; also, wasmtime's most recent version is 16.0, so
it'd make sense to bump the version at some point anyways. I did not
bump the version to 16.0 straight away as that'd require code changes in
`plugin_runtime`.
Release Notes:
- N/A
