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>

sdk/Cargo.toml

@@ -49,7 +49,7 @@ digest = { version = "0.9.0", optional = true }
 ed25519-dalek = { version = "=1.0.1", optional = true }
 ed25519-dalek-bip32 = { version = "0.1.1", optional = true }
 generic-array = { version = "0.14.4", default-features = false, features = ["serde", "more_lengths"], optional = true }
-hex = "0.4.2"
+hex = "0.4.3"
 hmac = "0.11.0"
 itertools =  "0.9.0"
 lazy_static = "1.4.0"