Bump cities-json from 0.6.3 to 0.6.6 in /rust in the dependencies group

Bumps the dependencies group in /rust with 1 update: [cities-json](https://github.com/ringsaturn/go-cities.json).


Updates `cities-json` from 0.6.3 to 0.6.6
- [Release notes](https://github.com/ringsaturn/go-cities.json/releases)
- [Commits](ringsaturn/go-cities.json@v0.6.3...v0.6.6)

---
updated-dependencies:
- dependency-name: cities-json
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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

rust/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 
 [dependencies]
 tzf-rs = "0.4.9"
-cities-json = "0.6.3"
+cities-json = "0.6.6"
 tz-search = "0.1.1"
 # rtz = {version = "0.5.3", features = ["full"]}
 rtz = { git = "https://github.com/twitchax/rtz", features = [