Update rustls requirement from =0.22.0-alpha.6 to =0.22.0

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](https://github.com/rustls/rustls/commits)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -16,15 +16,15 @@ hyper = { version = "0.14", default-features = false, features = ["client"] }
 log = { version = "0.4.4", optional = true }
 pki-types = { package = "rustls-pki-types", version = "0.2" }
 rustls-native-certs = { version = "=0.7.0-alpha.3", optional = true }
-rustls = { version = "=0.22.0-alpha.6", default-features = false }
+rustls = { version = "=0.22.0", default-features = false }
 tokio = "1.0"
 tokio-rustls = { version = "=0.25.0-alpha.4", default-features = false }
 webpki-roots = { version = "=0.26.0-alpha.2", optional = true }
 futures-util = { version = "0.3", default-features = false }
 
 [dev-dependencies]
 hyper = { version = "0.14", features = ["full"] }
-rustls = { version = "=0.22.0-alpha.6", default-features = false, features = ["tls12"] }
+rustls = { version = "=0.22.0", default-features = false, features = ["tls12"] }
 rustls-pemfile = "=2.0.0-alpha.2"
 tokio = { version = "1.0", features = ["io-std", "macros", "net", "rt-multi-thread"] }