build(deps): bump hkdf from 0.13.0-rc.5 to 0.13.0

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

---
updated-dependencies:
- dependency-name: hkdf
  dependency-version: 0.13.0
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ rust-version = "1.85"
 curve25519-dalek = { version = "5.0.0-pre.6", default-features = false, features = ["rand_core"] }
 rand_core = { version = "0.10", default-features = false }
 sha2 = { version = "0.11", default-features = false }
-hkdf = { version = "0.13.0-rc.5", default-features = false }
+hkdf = { version = "0.13.0", default-features = false }
 
 # optional dependencies
 getrandom = { version = "0.4", optional = true, features = ["sys_rng"] }