Update rcgen requirement from 0.11.1 to 0.12.0

Updates the requirements on [rcgen](https://github.com/rustls/rcgen) to permit the latest version.
- [Commits](rustls/rcgen@v0.11.1...v0.12.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

webpki-roots/Cargo.toml

@@ -14,7 +14,7 @@ pki-types = { workspace = true }
 [dev-dependencies]
 hex = { workspace = true }
 percent-encoding = "2.3"
-rcgen = "0.11.1"
+rcgen = "0.12.0"
 ring = "0.17.0"
 rustls = "0.22"
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }