Update rustls-pemfile requirement from 1.0.0 to 2.1.1

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/1.0.0...v/2.1.1)

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

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

kube-client/Cargo.toml

@@ -52,7 +52,7 @@ futures = { version = "0.3.17", optional = true }
 pem = { version = "3.0.1", optional = true }
 openssl = { version = "0.10.36", optional = true }
 rustls = { version = "0.21.4", features = ["dangerous_configuration"], optional = true }
-rustls-pemfile = { version = "1.0.0", optional = true }
+rustls-pemfile = { version = "2.1.1", 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 = "=0.88.1" }