chore(deps): update rcgen requirement from 0.11 to 0.12 (#572)

Updates the requirements on [rcgen](https://github.com/rustls/rcgen) to permit the latest version.
- [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-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -95,7 +95,7 @@ proc-macro2 = "1"
 quinn = { version = "0.10", default-features = false }
 quote = "1"
 rand = "0.8"
-rcgen = "0.11"
+rcgen = "0.12"
 regex = "1"
 ring = "0.17"
 rust_decimal = "1"