Update litrs requirement from 0.3.0 to 0.4.0 (#108)

Updates the requirements on [litrs](https://github.com/LukasKalbertodt/litrs) to permit the latest version.
- [Release notes](https://github.com/LukasKalbertodt/litrs/releases)
- [Changelog](https://github.com/LukasKalbertodt/litrs/blob/main/CHANGELOG.md)
- [Commits](LukasKalbertodt/litrs@v0.3.0...v0.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/stylist-macros/Cargo.toml

@@ -27,7 +27,7 @@ proc-macro = true
 [dependencies]
 stylist-core = { path = "../stylist-core", version = "0.12", features = ["parser"] }
 
-litrs = "0.3.0"
+litrs = "0.4.0"
 proc-macro-error = "1.0.4"
 proc-macro2 = "1.0.47"
 quote = "1.0.21"