gnu: Remove rust-futures-codec-0.4.

* gnu/packages/crates-io.scm (rust-futures-codec-0.4): Delete variable.

gnu/packages/crates-io.scm

@@ -23982,36 +23982,6 @@ featuring zero allocations, composability, and iterator-like interfaces.")
      "Channels for asynchronous communication using futures-rs.")
     (license (list license:expat license:asl2.0))))
 
-(define-public rust-futures-codec-0.4
-  (package
-    (name "rust-futures-codec")
-    (version "0.4.1")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "futures_codec" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "0nzadpxhdxdlnlk2f0gfn0qbifqc3pbnzm10v4z04x8ciczxcm6f"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:skip-build? #t
-       #:cargo-inputs
-       (("rust-bytes" ,rust-bytes-0.5)
-        ("rust-futures" ,rust-futures-0.3)
-        ("rust-memchr" ,rust-memchr-2)
-        ("rust-pin-project" ,rust-pin-project-0.4)
-        ("rust-serde" ,rust-serde-1)
-        ("rust-serde-cbor" ,rust-serde-cbor-0.11)
-        ("rust-serde-json" ,rust-serde-json-1))))
-    (home-page "https://github.com/matthunz/futures-codec")
-    (synopsis
-     "Utilities for encoding and decoding frames using @code{async/await}")
-    (description
-     "This package provides utilities for encoding and decoding frames using
-@code{async/await}.")
-    (license license:expat)))
-
 (define-public rust-futures-core-0.3
   (package
     (name "rust-futures-core")