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

Updates the requirements on [rcgen](https:/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]>

Cargo.toml

@@ -89,7 +89,7 @@ base64 = "0.21"
 bencher = "0.1.5"
 bzip2 = "0.4.4"
 once_cell = "1.17.2"
-rcgen = { version = "0.11.3", default-features = false }
+rcgen = { version = "0.12.0" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"