build: Bump smallvec from 1.12.0 to 1.13.1 in /fuzz

Bumps [smallvec](https://github.com/servo/rust-smallvec) from 1.12.0 to 1.13.1.
- [Release notes](https://github.com/servo/rust-smallvec/releases)
- [Commits](https://github.com/servo/rust-smallvec/compare/v1.12.0...v1.13.1)

---
updated-dependencies:
- dependency-name: smallvec
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

fuzz/Cargo.lock

@@ -785,9 +785,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.12.0"
+version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2593d31f82ead8df961d8bd23a64c2ccf2eb5dd34b0a34bfb4dd54011c72009e"
+checksum = "e6ecd384b10a64542d77071bd64bd7b231f4ed5940fba55e98c3de13824cf3d7"
 
 [[package]]
 name = "spin"