Bump serde from 1.0.99 to 1.0.100 (#5862)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.99 to 1.0.100.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](https://github.com/serde-rs/serde/compare/v1.0.99...v1.0.100)

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

netutil/Cargo.toml

@@ -15,7 +15,7 @@ clap = "2.33.0"
 log = "0.4.8"
 nix = "0.15.0"
 rand = "0.6.1"
-serde = "1.0.99"
+serde = "1.0.100"
 serde_derive = "1.0.99"
 socket2 = "0.3.11"
 solana-logger = { path = "../logger", version = "0.19.0-pre0" }