update itertools 0.11.0 -> 0.12.1

Summary:
[Release Notes for 0.12.0](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md#0120)
[Release Notes for 0.12.1](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md#0121)

### Breaking
- Made `take_while_inclusive` consume iterator by value ([#709](rust-itertools/itertools#709)) --- there are [2 usages](https://www.internalfb.com/code/search?q=repo%3Afbcode%20take_while_inclusive&lang_filter=rust) in fbcode, verified both manually
- Added `Clone` bound to `Unique` ([#777](rust-itertools/itertools#777)) --- there are [37 usages](https://fburl.com/code/hp7vdlch) in fbcode, CI will tell if it breaks

Reviewed By: anps77

Differential Revision: D64305791

fbshipit-source-id: fe99131b206905133c4d2b75693090f5ce44f4ca

below/store/Cargo.toml

@@ -26,7 +26,7 @@ static_assertions = "1.1.0"
 zstd-safe = { version = "7.0.0", features = ["std"] }
 
 [dev-dependencies]
-itertools = "0.11.0"
+itertools = "0.12.1"
 lazy_static = "1.4"
 paste = "1.0.14"
 slog-term = "2.8"

below/view/Cargo.toml

@@ -18,7 +18,7 @@ cursive = { version = "0.20.0", features = ["crossterm-backend"], default-featur
 cursive_buffered_backend = "0.6.1"
 enum-iterator = "1.4.1"
 humantime = "2.1"
-itertools = "0.11.0"
+itertools = "0.12.1"
 libc = "0.2.139"
 model = { package = "below-model", version = "0.8.1", path = "../model" }
 once_cell = "1.12"