Update rustls-native-certs requirement from 0.5.0 to 0.6.0

Updates the requirements on [rustls-native-certs](https://github.com/ctz/rustls-native-certs) to permit the latest version.
- [Release notes](https://github.com/ctz/rustls-native-certs/releases)
- [Commits](https://github.com/ctz/rustls-native-certs/compare/v/0.5.0...v/0.6.0)

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

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

Cargo.toml

@@ -48,7 +48,7 @@ version = "0.20.0"
 
 [dependencies.rustls-native-certs]
 optional = true
-version = "0.5.0"
+version = "0.6.0"
 
 [dependencies.webpki]
 optional = true