gnu: Remove rust-palette-0.5.

* gnu/packages/crates-io.scm (rust-palette-0.5): Delete variable.

gnu/packages/crates-io.scm

@@ -39858,35 +39858,6 @@ memory page size.")
      "This package pipes your Rust output through an external pager.")
     (license (list license:asl2.0 license:expat))))
 
-(define-public rust-palette-0.5
-  (package
-    (name "rust-palette")
-    (version "0.5.0")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (crate-uri "palette" version))
-        (file-name
-         (string-append name "-" version ".tar.gz"))
-        (sha256
-         (base32
-          "0nfc4ycdsx2qgf2wkcpxqxc0vmx7188jjjx3ppgs8qlf8qs06p50"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:skip-build? #t
-       #:cargo-inputs
-       (("rust-num-traits" ,rust-num-traits-0.2)
-        ("rust-approx" ,rust-approx-0.3)
-        ("rust-palette-derive" ,rust-palette-derive-0.5)
-        ("rust-phf" ,rust-phf-0.8)
-        ("rust-phf-codegen" ,rust-phf-codegen-0.8)
-        ("rust-serde" ,rust-serde-1))))
-    (home-page "https://github.com/Ogeon/palette")
-    (synopsis "Linear color calculations and conversion")
-    (description
-     "This package makes linear color calculations and conversion accessible.")
-    (license (list license:expat license:asl2.0))))
-
 (define-public rust-palette-derive-0.5
   (package
     (name "rust-palette-derive")