build: Bump log from 0.4.20 to 0.4.21 in /fuzz

Bumps [log](https://github.com/rust-lang/log) from 0.4.20 to 0.4.21.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang/log/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/log/compare/0.4.20...0.4.21)

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

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

fuzz/Cargo.lock

@@ -524,9 +524,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.20"
+version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
 
 [[package]]
 name = "micro_http"
@@ -721,19 +721,20 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.4.0"
+version = "3.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64cd236ccc1b7a29e7e2739f27c0b2dd199804abc4290e32f59f3b68d6405c23"
+checksum = "15d167997bd841ec232f5b2b8e0e26606df2e7caa4c31b95ea9ca52b200bd270"
 dependencies = [
  "serde",
+ "serde_derive",
  "serde_with_macros",
 ]
 
 [[package]]
 name = "serde_with_macros"
-version = "3.4.0"
+version = "3.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93634eb5f75a2323b16de4748022ac4297f9e76b6dced2be287a099f41b5e788"
+checksum = "865f9743393e638991566a8b7a479043c2c8da94a33e0a31f18214c9cae0a64d"
 dependencies = [
  "darling",
  "proc-macro2",