Bump serde from 1.0.103 to 1.0.104

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.103 to 1.0.104.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.103...v1.0.104)

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

Author: dependabot-preview[bot]

Cargo.lock

@@ -51,7 +51,7 @@ structopt = "0.3.5"
 tai64 = "3.1.0"
 ansi_term = "0.12.1"
 atty = "0.2.13"
-serde = { version = "1.0.103", features = ["derive"] }
+serde = { version = "1.0.104", features = ["derive"] }
 toml = "0.5.5"
 anyhow = "1.0.25"
 num-traits = "0.2.10"