update clap to v3.2.8 in third-party/rust

Summary:
v3.2.8 incorporates clap-rs/clap#3882, which is needed for some of the Clap w/ Python CLI fallback code I'm working on.

Ran all of the steps in https://www.internalfb.com/intern/wiki/Rust-at-facebook/Managing_fbsource_third-party_with_Reindeer/#overview

Reviewed By: zertosh

Differential Revision: D37566754

fbshipit-source-id: 998a4cd79c660d34c5e8468b2b27b6e0971f80ef

below/Cargo.toml

@@ -13,7 +13,7 @@ license = "Apache-2.0"
 [dependencies]
 anyhow = "1.0.56"
 cgroupfs = { version = "0.5.0", path = "cgroupfs" }
-clap = { version = "3.2.6", features = ["derive", "regex", "unicode", "wrap_help"] }
+clap = { version = "3.2.8", features = ["derive", "regex", "unicode", "wrap_help"] }
 clap_complete = "3.0.4"
 common = { package = "below-common", version = "0.5.0", path = "common" }
 config = { package = "below-config", version = "0.5.0", path = "config" }

below/dump/Cargo.toml

@@ -12,7 +12,7 @@ license = "Apache-2.0"
 [dependencies]
 anyhow = "1.0.56"
 below_derive = { version = "0.5.0", path = "../below_derive" }
-clap = { version = "3.2.6", features = ["derive", "regex", "unicode", "wrap_help"] }
+clap = { version = "3.2.8", features = ["derive", "regex", "unicode", "wrap_help"] }
 common = { package = "below-common", version = "0.5.0", path = "../common" }
 model = { package = "below-model", version = "0.5.0", path = "../model" }
 once_cell = "1.12"