Fix up compact_str versions after third-party compact-str upgrade

Summary: Our cargo builds broke when D62024938 landed because our manually maintained cargo versions didn't keep up with the upgrade of compact_str in third-party/rust. Upgrade our versions to 0.8 to match D62024938.

Reviewed By: Will-MingLun-Li

Differential Revision: D62050752

fbshipit-source-id: 1f4eaded370c6ab09bbbf94ed1d5f0ab3af374d6

allocative/allocative/Cargo.toml

@@ -15,7 +15,7 @@ ctor = { workspace = true }
 
 anyhow = { version = "1.0.65", optional = true }
 bumpalo = { version = "3.11.1", optional = true }
-compact_str = { version = "0.6.1", optional = true }
+compact_str = { version = "0.8", optional = true }
 dashmap = { version = "5.5.3", optional = true }
 either = { version = "1.8", optional = true }
 futures = { version = "0.3.24", optional = true }