build(deps): Bump serde from 1.0.190 to 1.0.191

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.190 to 1.0.191.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.190...v1.0.191)

---
updated-dependencies:
- dependency-name: serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -24,7 +24,7 @@ ctrlc = "3.4.1"
 structopt = "0.3.26"
 futures-timer = "3.0.2"
 maxminddb = "0.23.0"
-serde = "1.0.190"
+serde = "1.0.191"
 serde_derive = "1.0.125"
 toml = "0.8.6"