gnu: Remove rust-try-from-0.3.

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

gnu/packages/crates-io.scm

@@ -62947,28 +62947,6 @@ (define-public rust-trust-dns-rustls-0.6
        (("rust-openssl" ,rust-openssl-0.10)
         ("rust-tokio" ,rust-tokio-0.1))))))
 
-(define-public rust-try-from-0.3
-  (package
-    (name "rust-try-from")
-    (version "0.3.2")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "try_from" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32
-         "12wdd4ja7047sd3rx70hv2056hyc8gcdllcx3a41g1rnw64kng98"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:cargo-inputs
-       (("rust-cfg-if" ,rust-cfg-if-0.1))))
-    (home-page "https://github.com/derekjw/try_from")
-    (synopsis "TryFrom and TryInto traits for failable conversions")
-    (description
-     "TryFrom and TryInto traits for failable conversions that return a Result.")
-    (license license:expat)))
-
 (define-public rust-try-lock-0.2
   (package
     (name "rust-try-lock")