Update itertools requirement from 0.11.0 to 0.12.0

Updates the requirements on [itertools](https://github.com/rust-itertools/itertools) to permit the latest version.
- [Changelog](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md)
- [Commits](rust-itertools/itertools@v0.11.0...v0.12.0)

---
updated-dependencies:
- dependency-name: itertools
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/stylist-macros/Cargo.toml

@@ -26,7 +26,7 @@ proc-macro2 = "1.0.47"
 quote = "1.0.21"
 nom = "7.1.1"
 syn = { version = "2", features = ["full", "extra-traits"] }
-itertools = "0.11.0"
+itertools = "0.12.0"
 log = "0.4.17"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]