gnu: Remove rust-rlp-0.3.

* gnu/packages/crates-io.scm (rust-rlp-0.3): Delete variable.

gnu/packages/crates-io.scm

@@ -48433,27 +48433,6 @@ your own implementation.")
 decoding, and compression.")
     (license (list license:expat license:asl2.0))))
 
-(define-public rust-rlp-0.3
-  (package
-    (inherit rust-rlp-0.5)
-    (name "rust-rlp")
-    (version "0.3.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "rlp" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "082pfkdzsnzvqr5yx5qb2hildjg597p2115ywy84zma5k3zfzl8n"))))
-    (arguments
-     `(#:tests? #f                      ; The tests fail.
-       #:cargo-inputs
-       (("rust-byteorder" ,rust-byteorder-1)
-        ("rust-ethereum-types" ,rust-ethereum-types-0.4)
-        ("rust-rustc-hex" ,rust-rustc-hex-2))
-       #:cargo-development-inputs
-       (("rust-hex-literal" ,rust-hex-literal-0.1))))))
-
 (define-public rust-rls-span-0.5
   (package
     (name "rust-rls-span")