Bump chrono from 0.4.7 to 0.4.8 (#5761)

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.7 to 0.4.8.
- [Release notes](https://github.com/chronotope/chrono/releases)
- [Changelog](https://github.com/chronotope/chrono/blob/master/CHANGELOG.md)
- [Commits](https://github.com/chronotope/chrono/commits)

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

cli/Cargo.toml

@@ -11,7 +11,7 @@ homepage = "https://solana.com/"
 [dependencies]
 bincode = "1.1.4"
 bs58 = "0.2.5"
-chrono = { version = "0.4.7", features = ["serde"] }
+chrono = { version = "0.4.8", features = ["serde"] }
 clap = "2.33.0"
 criterion-stats = "0.3.0"
 ctrlc = { version = "3.1.3", features = ["termination"] }