fix the installation of Rust in the CI

!39 (merged) and !40 (merged) changed the CI to use a toolchain file.

however, having default as the $.profile causes extra useless components to be installed.

this MR sets the $.profile to minimal in the toolchain file and the $.components to rustfmt and clippy.

rust-toolchain.toml

 [toolchain]
 profile = "default"
 channel = "1.75"
+components = ["rustfmt", "clippy"]