build(deps): Update rcgen requirement from 0.11.3 to 0.12.0

Updates the requirements on [rcgen](https://github.com/rustls/rcgen) to permit the latest version.
- [Commits](rustls/rcgen@v0.11.3...v0.12.0)

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

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

core/network/Cargo.toml

@@ -20,7 +20,7 @@ hyper = { version = "0.14.27", features = ["full"], optional = true }
 tokio-rustls = { version = "0.24.1", optional = true }
 rand = "0.8.5"
 random-manager = "0.0.5" # https://crates.io/crates/random-manager/versions
-rcgen = { version = "0.11.3", features = ["pem", "x509-parser"] }
+rcgen = { version = "0.12.0", features = ["pem", "x509-parser"] }
 rsa = { version = "0.9.2", features = ["pem"] } # https://crates.io/crates/rsa
 rustls-pemfile = "1.0.3"
 x509-parser = "0.15.1"