Update Rust crate chrono to 0.4.19

Author: renovate-bot

Cargo.toml

@@ -34,7 +34,7 @@ anyhow = "1.0"
 base64 = "0.13"
 cargo-registry-markdown = { path = "cargo-registry-markdown" }
 cargo-registry-s3 = { path = "cargo-registry-s3" }
-chrono = { version = "0.4.0", features = ["serde"] }
+chrono = { version = "0.4.19", features = ["serde"] }
 clap = "=3.0.0-beta.5"
 
 conduit = "0.9.0-alpha.5"