build: Bump darling from 0.20.0 to 0.20.1 in /fuzz

Bumps [darling](https://github.com/TedDriggs/darling) from 0.20.0 to 0.20.1.
- [Release notes](https://github.com/TedDriggs/darling/releases)
- [Changelog](https://github.com/TedDriggs/darling/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TedDriggs/darling/compare/v0.20.0...v0.20.1)

---
updated-dependencies:
- dependency-name: darling
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

fuzz/Cargo.lock

@@ -208,9 +208,9 @@ checksum = "55626594feae15d266d52440b26ff77de0e22230cf0c113abe619084c1ddc910"
 
 [[package]]
 name = "darling"
-version = "0.20.0"
+version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7c99d16b88c92aef47e58dadd53e87b4bd234c29934947a6cec8b466300f99b"
+checksum = "0558d22a7b463ed0241e993f76f09f30b126687447751a8638587b864e4b3944"
 dependencies = [
  "darling_core",
  "darling_macro",
@@ -218,9 +218,9 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.20.0"
+version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ea05d2fcb27b53f7a98faddaf5f2914760330ab7703adfc9df13332b42189f9"
+checksum = "ab8bfa2e259f8ee1ce5e97824a3c55ec4404a0d772ca7fa96bf19f0752a046eb"
 dependencies = [
  "fnv",
  "ident_case",
@@ -232,9 +232,9 @@ dependencies = [
 
 [[package]]
 name = "darling_macro"
-version = "0.20.0"
+version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bfb82b62b1b8a2a9808fb4caf844ede819a76cfc23b2827d7f94eefb49551eb"
+checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",