Remove unused hpke dependency

Author: sosthene-nitrokey

Cargo.toml

@@ -48,7 +48,6 @@ trussed-hpke = { version = "0.1.0", optional = true }
 trussed-manage = { version = "0.1.0", optional = true }
 trussed-wrap-key-to-file = { version = "0.1.0", optional = true }
 salty = { version = "0.3.0", default-features = false }
-hpke = { version = "0.11.0", default-features = false }
 digest = { version = "0.10.7", default-features = false }
 hex-literal = { version = "0.4.0", optional = true }
 aead = { version = "0.5.2", optional = true, default-features = false }