bump some deps

drop num_cpus from rust-installer as not used
update rayon, rayon-core, which drops it's deps on num_cpus and crossbeam-channel (for bootstrap too) (https://github.com/rayon-rs/rayon/blob/v1.8.0/RELEASES.md)
update erro, which drops errno-dragonfly (5341791935/CHANGELOG.md)

src/tools/rust-installer/Cargo.toml

@@ -16,7 +16,6 @@ rayon = "1.0"
 tar = "0.4.38"
 walkdir = "2"
 xz2 = "0.1.4"
-num_cpus = "1"
 
 [dependencies.clap]
 features = ["derive"]

src/tools/tidy/src/deps.rs

@@ -228,7 +228,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "ena",
     "equivalent",
     "errno",
-    "errno-dragonfly",
     "expect-test",
     "fallible-iterator", // dependency of `thorin`
     "fastrand",