build(deps): bump serde from 1.0.203 to 1.0.204 in /nym-vpn-core

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.203 to 1.0.204.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.203...v1.0.204)

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

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

nym-vpn-core/Cargo.toml

@@ -69,7 +69,7 @@ prost = "0.12.6"
 prost-types = "0.12.6"
 rand = "0.8.5"
 reqwest = { version = "0.11.27", default-features = false }
-serde = "1.0.203"
+serde = "1.0.204"
 serde_json = "1.0.120"
 signature = "2.2.0"
 tap = "1.0.1"