Update chrono-tz requirement from 0.5 to 0.6 (#982)

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](https://github.com/chronotope/chrono-tz/commits/v0.6.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

juniper/Cargo.toml

@@ -38,7 +38,7 @@ anyhow = { version = "1.0.32", optional = true, default-features = false }
 async-trait = "0.1.39"
 bson = { version = "2.0", features = ["chrono-0_4"], optional = true }
 chrono = { version = "0.4", default-features = false, optional = true }
-chrono-tz = { version = "0.5", default-features = false, optional = true }
+chrono-tz = { version = "0.6", default-features = false, optional = true }
 fnv = "1.0.3"
 futures = { version = "0.3.1", features = ["alloc"], default-features = false }
 futures-enum = { version = "0.1.12", default-features = false }