Update rustls-pemfile requirement from 0.2.1 to 0.3.0

Updates the requirements on [rustls-pemfile](https://github.com/rustls/pemfile) to permit the latest version.
- [Release notes](https://github.com/rustls/pemfile/releases)
- [Commits](rustls/pemfile@v/0.2.1...v/0.3.0)

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

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

kube-client/Cargo.toml

@@ -53,7 +53,7 @@ pem = { version = "1.0.1", optional = true }
 openssl = { version = "0.10.36", optional = true }
 tokio-native-tls = { version = "0.3.0", optional = true }
 rustls = { version = "0.20.1", features = ["dangerous_configuration"], optional = true }
-rustls-pemfile = { version = "0.2.1", optional = true }
+rustls-pemfile = { version = "0.3.0", optional = true }
 bytes = { version = "1.1.0", optional = true }
 tokio = { version = "1.14.0", features = ["time", "signal", "sync"], optional = true }
 kube-core = { path = "../kube-core", version = "^0.69.0"}