chore: bump hex from 0.4.2 to 0.4.3 (#17829)

* chore: bump hex from 0.4.2 to 0.4.3

Bumps [hex](https://github.com/KokaKiwi/rust-hex) from 0.4.2 to 0.4.3.
- [Release notes](https://github.com/KokaKiwi/rust-hex/releases)
- [Commits](https://github.com/KokaKiwi/rust-hex/compare/v0.4.2...v0.4.3)

---
updated-dependencies:
- dependency-name: hex
  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>

merkle-tree/Cargo.toml

@@ -18,7 +18,7 @@ fast-math = "0.1"
 matches = "0.1.8"
 
 [dev-dependencies]
-hex = "0.4.2"
+hex = "0.4.3"
 
 [lib]
 crate-type = ["lib"]