Update pqcrypto-kyber requirement from 0.7 to 0.8

Updates the requirements on [pqcrypto-kyber](https://github.com/rustpq/pqcrypto) to permit the latest version.
- [Release notes](https://github.com/rustpq/pqcrypto/releases)
- [Changelog](https://github.com/rustpq/pqcrypto/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rustpq/pqcrypto/commits)

---
updated-dependencies:
- dependency-name: pqcrypto-kyber
  dependency-type: direct:production
...

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

Cargo.toml

@@ -47,7 +47,7 @@ blake2 = { version = "0.10", optional = true }
 sha2 = { version = "0.10", optional = true }
 curve25519-dalek = { version = "4", optional = true }
 
-pqcrypto-kyber = { version = "0.7", optional = true }
+pqcrypto-kyber = { version = "0.8", optional = true }
 pqcrypto-traits = { version = "0.3", optional = true }
 
 # ring crypto provider