Update immediate and transitive dependencies

I don't think this has happened in awhile but I've run a `cargo update`
as well as trimming some of the duplicate/older dependencies in
`Cargo.lock` by updating some of our immediate dependencies as well.

cranelift/peepmatic/crates/fuzzing/Cargo.toml

@@ -10,7 +10,7 @@ publish = false
 [dependencies]
 arbitrary = { version = "0.4.1", features = ["derive"] }
 bincode = "1.2.1"
-env_logger = "0.7.1"
+env_logger = "0.8.1"
 fst = "0.4.1"
 log = "0.4.8"
 peepmatic = { path = "../.." }