Update darling requirement from 0.21 to 0.23

Updates the requirements on [darling](https://github.com/TedDriggs/darling) to permit the latest version.
- [Release notes](https://github.com/TedDriggs/darling/releases)
- [Changelog](https://github.com/TedDriggs/darling/blob/master/CHANGELOG.md)
- [Commits](TedDriggs/darling@v0.21.0...v0.23.0)

---
updated-dependencies:
- dependency-name: darling
  dependency-version: 0.23.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

enumset_derive/Cargo.toml

@@ -19,7 +19,7 @@ std_deprecation_warning = []
 serde2_deprecation_warning = []
 
 [dependencies]
-darling = { version = "0.21", default-features = false }
+darling = { version = "0.23", default-features = false }
 syn = "2"
 quote = "1"
 proc-macro2 = "1"