build(deps): bump darling_core from 0.20.11 to 0.21.2

Bumps [darling_core](https://github.com/TedDriggs/darling) from 0.20.11 to 0.21.2.
- [Release notes](https://github.com/TedDriggs/darling/releases)
- [Changelog](https://github.com/TedDriggs/darling/blob/master/CHANGELOG.md)
- [Commits](TedDriggs/darling@v0.20.11...v0.21.2)

---
updated-dependencies:
- dependency-name: darling_core
  dependency-version: 0.21.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -51,7 +51,7 @@ crossbeam-epoch = { version = "0.9.18" }
 crossbeam-queue = { version = "0.3.12" }
 crossbeam-utils = { version = "0.8.21" }
 csv-async = { version = "1.3.1", features = ["tokio"] }
-darling_core = { version = "0.20.11", default-features = false, features = ["suggestions"] }
+darling_core = { version = "0.21.2", default-features = false, features = ["suggestions"] }
 dec = { version = "0.4.11", default-features = false, features = ["num-traits", "serde"] }
 deranged = { version = "0.3.11", default-features = false, features = ["powerfmt", "quickcheck", "serde", "std"] }
 digest = { version = "0.10.7", features = ["mac", "oid", "std"] }
@@ -198,7 +198,7 @@ crossbeam-epoch = { version = "0.9.18" }
 crossbeam-queue = { version = "0.3.12" }
 crossbeam-utils = { version = "0.8.21" }
 csv-async = { version = "1.3.1", features = ["tokio"] }
-darling_core = { version = "0.20.11", default-features = false, features = ["suggestions"] }
+darling_core = { version = "0.21.2", default-features = false, features = ["suggestions"] }
 dec = { version = "0.4.11", default-features = false, features = ["num-traits", "serde"] }
 deranged = { version = "0.3.11", default-features = false, features = ["powerfmt", "quickcheck", "serde", "std"] }
 digest = { version = "0.10.7", features = ["mac", "oid", "std"] }