gnu: Remove rust-gumdrop-0.7.

* gnu/packages/crates-io.scm (rust-gumdrop-0.7): Delete variable.

gnu/packages/crates-io.scm

@@ -24673,26 +24673,6 @@ provides standard printing of search results, similar to grep itself.")
 support.")
     (license (list license:expat license:asl2.0))))
 
-(define-public rust-gumdrop-0.7
-  (package
-    (inherit rust-gumdrop-0.8)
-    (name "rust-gumdrop")
-    (version "0.7.0")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (crate-uri "gumdrop" version))
-        (file-name (string-append name "-" version ".tar.gz"))
-        (sha256
-          (base32 "1pmw21ggwqqizh66zp7bylbffi6qs064w2rfj3rc3smyq65r0l7f"))))
-    (arguments
-      `(#:skip-build?
-        #t
-        #:cargo-inputs
-        (("rust-gumdrop-derive" ,rust-gumdrop-derive-0.7))
-        #:cargo-development-inputs
-        (("rust-assert-matches" ,rust-assert-matches-1))))))
-
 (define-public rust-gumdrop-derive-0.8
   (package
     (name "rust-gumdrop-derive")