build(deps): update rustls requirement from 0.21.9 to 0.23.8

Updates the requirements on [rustls](https://github.com/rustls/rustls) to permit the latest version.
- [Release notes](https://github.com/rustls/rustls/releases)
- [Changelog](https://github.com/rustls/rustls/blob/main/CHANGELOG.md)
- [Commits](rustls/rustls@v/0.21.9...v/0.21.12)

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

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

mpc-net/Cargo.toml

@@ -21,7 +21,7 @@ futures = { workspace = true }
 quinn = "0.10"
 rcgen = { workspace = true }
 # need this rustls version for quinn
-rustls = { version = "0.21.9", features = ["quic", "dangerous_configuration"] }
+rustls = { version = "0.23.8", features = ["quic", "dangerous_configuration"] }
 serde = { workspace = true }
 tokio = { workspace = true }
 tokio-util = { version = "0.7.10", features = ["codec"] }