build: Bump darling from 0.20.6 to 0.20.8 in /fuzz

Bumps [darling](https://github.com/TedDriggs/darling) from 0.20.6 to 0.20.8.
- [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/v0.20.6...v0.20.8)

---
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

@@ -280,9 +280,9 @@ checksum = "2707e3afba5e19b75d582d88bc79237418f2a2a2d673d01cf9b03633b46e98f3"
 
 [[package]]
 name = "darling"
-version = "0.20.6"
+version = "0.20.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c376d08ea6aa96aafe61237c7200d1241cb177b7d3a542d791f2d118e9cbb955"
+checksum = "54e36fcd13ed84ffdfda6f5be89b31287cbb80c439841fe69e04841435464391"
 dependencies = [
  "darling_core",
  "darling_macro",
@@ -290,9 +290,9 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.20.6"
+version = "0.20.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33043dcd19068b8192064c704b3f83eb464f91f1ff527b44a4e2b08d9cdb8855"
+checksum = "9c2cf1c23a687a1feeb728783b993c4e1ad83d99f351801977dd809b48d0a70f"
 dependencies = [
  "fnv",
  "ident_case",
@@ -304,9 +304,9 @@ dependencies = [
 
 [[package]]
 name = "darling_macro"
-version = "0.20.6"
+version = "0.20.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c5a91391accf613803c2a9bf9abccdbaa07c54b4244a5b64883f9c3c137c86be"
+checksum = "a668eda54683121533a393014d8692171709ff57a7d61f187b6e782719f8933f"
 dependencies = [
  "darling_core",
  "quote",