Update chrono-tz requirement from 0.8 to 0.9

Updates the requirements on [chrono-tz](https://github.com/chronotope/chrono-tz) to permit the latest version.
- [Release notes](https://github.com/chronotope/chrono-tz/releases)
- [Changelog](https://github.com/chronotope/chrono-tz/blob/main/CHANGELOG.md)
- [Commits](chronotope/chrono-tz@v0.8.0...v0.9.0)

---
updated-dependencies:
- dependency-name: chrono-tz
  dependency-type: direct:production
...

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

Cargo.toml

@@ -18,7 +18,7 @@ amtk = "0.1.0"
 amtrak-api = "0.1.0"
 base64 = "0.21"
 chrono = "0.4"
-chrono-tz = "0.8"
+chrono-tz = "0.9"
 geojson = "0.24"
 gtfs-rt = "0.5"
 gtfs-structures = "0.41.2"