update itertools: 13.0.0 -> 14.0.0

Summary:
[Changes](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md) to be aware of, with [971](rust-itertools/itertools#971) as my favourite:

 {F1974159737}

Differential Revision: D67751950

fbshipit-source-id: d5e39b7c685840b40aa7ba1b5015e8ccaea32b72

pyre2/pyre2/Cargo.toml

@@ -20,7 +20,7 @@ dupe = "0.9.0"
 enum-iterator = "1.4.1"
 equivalent = "1.0"
 human_bytes = "0.4.3"
-itertools = "0.13.0"
+itertools = "0.14.0"
 lsp-server = "0.7.2"
 lsp-types = "0.94.1"
 memory-stats = "1.0.0"