deps: bump rustls from 0.21.5 to 0.21.6

Bumps [rustls](https://github.com/rustls/rustls) from 0.21.5 to 0.21.6.
- [Release notes](https://github.com/rustls/rustls/releases)
- [Commits](rustls/rustls@v/0.21.5...v/0.21.6)

---
updated-dependencies:
- dependency-name: rustls
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

transports/quic/Cargo.toml

@@ -21,7 +21,7 @@ log = "0.4"
 parking_lot = "0.12.0"
 quinn = { version = "0.10.1", default-features = false, features = ["tls-rustls", "futures-io"] }
 rand = "0.8.5"
-rustls = { version = "0.21.2", default-features = false }
+rustls = { version = "0.21.6", default-features = false }
 thiserror = "1.0.44"
 tokio = { version = "1.29.1", default-features = false, features = ["net", "rt", "time"], optional = true }
 

transports/tls/Cargo.toml

@@ -22,7 +22,7 @@ yasna = "0.5.2"
 
 # Exposed dependencies. Breaking changes to these are breaking changes to us.
 [dependencies.rustls]
-version = "0.21.2"
+version = "0.21.6"
 default-features = false
 features = ["dangerous_configuration"] # Must enable this to allow for custom verification code.