build: Bump remain from 0.2.12 to 0.2.13 in /fuzz

Bumps [remain](https://github.com/dtolnay/remain) from 0.2.12 to 0.2.13.
- [Release notes](https://github.com/dtolnay/remain/releases)
- [Commits](https://github.com/dtolnay/remain/compare/0.2.12...0.2.13)

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

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

fuzz/Cargo.lock

@@ -668,9 +668,9 @@ dependencies = [
 
 [[package]]
 name = "remain"
-version = "0.2.12"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ad5e011230cad274d0532460c5ab69828ea47ae75681b42a841663efffaf794"
+checksum = "ad9f2390298a947ee0aa6073d440e221c0726188cfbcdf9604addb6ee393eb4a"
 dependencies = [
  "proc-macro2",
  "quote",