Update rustls requirement from 0.21 to 0.22

Updates the requirements on [rustls](https://github.com/rustls/rustls) to permit the latest version.
- [Release notes](https://github.com/rustls/rustls/releases)
- [Changelog](https://github.com/rustls/rustls/blob/main/CHANGELOG.md)
- [Commits](rustls/rustls@v/0.21.0...v/0.22.0)

---
updated-dependencies:
- dependency-name: rustls
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -25,5 +25,5 @@ tokio = "1"
 futures = "0.3"
 lazy_static = "1"
 rcgen = "0.11"
-rustls = "0.21"
+rustls = "0.22"
 tokio = { version = "1", features = ["macros", "rt", "sync"] }