build(deps): bump libc in /benchmarks/competitors/servo-url

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.139 to 0.2.146.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](rust-lang/libc@0.2.139...0.2.146)

---
updated-dependencies:
- dependency-name: libc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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