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](https://github.com/serde-rs/serde/compare/v1.0.103...v1.0.104)

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

net-utils/Cargo.toml

@@ -15,7 +15,7 @@ clap = "2.33.0"
 log = "0.4.8"
 nix = "0.16.0"
 rand = "0.6.1"
-serde = "1.0.103"
+serde = "1.0.104"
 serde_derive = "1.0.103"
 socket2 = "0.3.11"
 solana-clap-utils = { path = "../clap-utils", version = "0.22.0" }