chore: bump libc from 0.2.98 to 0.2.99 (#19142)

* chore: bump libc from 0.2.98 to 0.2.99

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.98 to 0.2.99.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](https://github.com/rust-lang/libc/compare/0.2.98...0.2.99)

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

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

* [auto-commit] Update all Cargo lock files

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot-buildkite <dependabot-buildkite@noreply.solana.com>

validator/Cargo.toml

@@ -52,7 +52,7 @@ solana-vote-program = { path = "../programs/vote", version = "=1.8.0" }
 symlink = "0.1.0"
 
 [target."cfg(unix)".dependencies]
-libc = "0.2.98"
+libc = "0.2.99"
 signal-hook = "0.2.3"
 
 [package.metadata.docs.rs]