Update rcgen requirement from 0.11 to 0.13

Updates the requirements on [rcgen](https://github.com/rustls/rcgen) to permit the latest version.
- [Release notes](https://github.com/rustls/rcgen/releases)
- [Changelog](https://github.com/rustls/rcgen/blob/v0.11.3/CHANGELOG.md)
- [Commits](rustls/rcgen@v0.11.0...v0.11.3)

---
updated-dependencies:
- dependency-name: rcgen
  dependency-version: 0.11.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -28,7 +28,7 @@ quinn = "0.10"
 quinn-proto = "0.10"
 rand_chacha = "0.3"
 rand_core = "0.6"
-rcgen = "0.11"
+rcgen = "0.13"
 rustls = { version = "0.21", features = ["dangerous_configuration"] }
 secp256k1 = { version = "0.30", features = ["recovery", "rand"] }
 serde = { version = "1.0", features = ["derive"] }