Update pretty crate from 0.10 to 0.12.1

Summary: Version 0.10 was from 3 years ago, version 0.12.1 is from 3 months ago.

Reviewed By: zertosh

Differential Revision: D47176285

fbshipit-source-id: 4618279136c07b18d7aa56c69d2201c5f3d3a1a8

detcore/Cargo.toml

@@ -37,7 +37,7 @@ futures = { version = "0.3.28", features = ["async-await", "compat"] }
 lazy_static = "1.4"
 libc = "0.2.139"
 nix = "0.25"
-pretty = "0.10"
+pretty = "0.12.1"
 pretty_assertions = { version = "1.2", features = ["alloc"], default-features = false }
 procfs = "0.10.1"
 rand = { version = "0.8", features = ["small_rng"] }