Update thiserror requirement from 1.0.37 to 2.0.18

Updates the requirements on [thiserror](https://github.com/dtolnay/thiserror) to permit the latest version.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](dtolnay/thiserror@1.0.37...2.0.18)

---
updated-dependencies:
- dependency-name: thiserror
  dependency-version: 2.0.18
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/stylist-core/Cargo.toml

@@ -18,7 +18,7 @@ rust-version = "1.84.0"
 
 [dependencies]
 nom = { version = "7.1.1", optional = true }
-thiserror = "1.0.37"
+thiserror = "2.0.18"
 wasm-bindgen = "0.2.83"
 once_cell = "1.16.0"
 serde = { version = "1", features = ["derive"] }