Auto merge of #1025 - mati865:deps, r=RalfJung

Bump dependencies

Author: bors

Cargo.lock

@@ -30,15 +30,15 @@ doctest = false # and no doc tests
 required-features = ["rustc_tests"]
 
 [dependencies]
-cargo_metadata = { version = "0.8", optional = true }
+cargo_metadata = { version = "0.9.0", optional = true }
 directories = { version = "2.0", optional = true }
 rustc_version = { version = "0.2.3", optional = true }
 getrandom = { version = "0.1.8", features = ["std"] }
 byteorder = "1.3"
-env_logger = "0.6"
+env_logger = "0.7.1"
 log = "0.4"
 shell-escape = "0.1.4"
-hex = "0.3.2"
+hex = "0.4.0"
 rand = "0.7"
 
 # A noop dependency that changes in the Rust repository, it's a bit of a hack.