Bump chrono from 0.4.6 to 0.4.7 (#4812)

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.6 to 0.4.7.
- [Release notes](https://github.com/chronotope/chrono/releases)
- [Changelog](https://github.com/chronotope/chrono/blob/master/CHANGELOG.md)
- [Commits](https://github.com/chronotope/chrono/compare/v0.4.6...v0.4.7)

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

sdk/Cargo.toml

@@ -13,7 +13,7 @@ assert_matches = "1.3.0"
 bincode = "1.1.4"
 bs58 = "0.2.0"
 byteorder = "1.3.2"
-chrono = { version = "0.4.0", features = ["serde"] }
+chrono = { version = "0.4.7", features = ["serde"] }
 generic-array = { version = "0.13.0", default-features = false, features = ["serde"] }
 hex = "0.3.2"
 itertools = "0.8.0"