chore(deps): bump hkdf from 0.13.0-rc.5 to 0.13.0-rc.6 (#1477)

Bumps [hkdf](https://github.com/RustCrypto/KDFs) from 0.13.0-rc.5 to 0.13.0-rc.6.
- [Commits](RustCrypto/KDFs@hkdf-v0.13.0-rc.5...hkdf-v0.13.0-rc.6)

---
updated-dependencies:
- dependency-name: hkdf
  dependency-version: 0.13.0-rc.6
  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

@@ -91,7 +91,7 @@ elliptic-curve = { version = "0.14.0-rc.29", features = [
   "alloc",
   "sec1",
 ], default-features = false, optional = true }
-hkdf = { version = "0.13.0-rc.5", default-features = false, optional = true }
+hkdf = { version = "0.13.0-rc.6", default-features = false, optional = true }
 hmac = { version = "0.13.0-rc.6", default-features = false, optional = true }
 rsa = { version = "0.10.0-rc.17", features = [
   "std",