build(deps): bump hkdf from 0.12.3 to 0.12.4 (#1417)

Bumps [hkdf](https://github.com/RustCrypto/KDFs) from 0.12.3 to 0.12.4.
- [Commits](RustCrypto/KDFs@hkdf-v0.12.3...hkdf-v0.12.4)

---
updated-dependencies:
- dependency-name: hkdf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -28,7 +28,7 @@ base64ct = { version = "1", optional = true, default-features = false, features
 digest = { version = "0.10", optional = true }
 ff = { version = "0.13", optional = true, default-features = false }
 group = { version = "0.13", optional = true, default-features = false }
-hkdf = { version = "0.12.1", optional = true, default-features = false }
+hkdf = { version = "0.12.4", optional = true, default-features = false }
 hex-literal = { version = "0.4", optional = true }
 pem-rfc7468 = { version = "0.7", optional = true, features = ["alloc"] }
 pkcs8 = { version = "0.10.2", optional = true, default-features = false }