build: Bump remain from 0.2.11 to 0.2.12 in /fuzz

Bumps [remain](https://github.com/dtolnay/remain) from 0.2.11 to 0.2.12.
- [Release notes](https://github.com/dtolnay/remain/releases)
- [Commits](https://github.com/dtolnay/remain/compare/0.2.11...0.2.12)

---
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

@@ -660,9 +660,9 @@ dependencies = [
 
 [[package]]
 name = "remain"
-version = "0.2.11"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bce3a7139d2ee67d07538ee5dba997364fbc243e7e7143e96eb830c74bfaa082"
+checksum = "1ad5e011230cad274d0532460c5ab69828ea47ae75681b42a841663efffaf794"
 dependencies = [
  "proc-macro2",
  "quote",