Bump hex from 0.4.1 to 0.4.2 (#8725)

Bumps [hex](https://github.com/KokaKiwi/rust-hex) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/KokaKiwi/rust-hex/releases)
- [Commits](https://github.com/KokaKiwi/rust-hex/compare/v0.4.1...v0.4.2)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

sdk/Cargo.toml

@@ -33,7 +33,7 @@ bv = { version = "0.11.0", features = ["serde"] }
 byteorder = { version = "1.3.4", optional = true }
 chrono = { version = "0.4", optional = true }
 generic-array = { version = "0.13.2", default-features = false, features = ["serde", "more_lengths"] }
-hex = "0.4.0"
+hex = "0.4.2"
 hmac = "0.7.0"
 itertools = { version = "0.8.2" }
 log = { version = "0.4.8" }