gnu: ruby-sanitize: Update to 4.6.3.

This fixes CVE-2018-3740.

* gnu/packages/ruby.scm (ruby-sanitize): Update to 4.6.3.

gnu/packages/ruby.scm

@@ -3082,7 +3082,7 @@ access the result as a Nokogiri parsed document.")
 (define-public ruby-sanitize
   (package
     (name "ruby-sanitize")
-    (version "4.0.0")
+    (version "4.6.3")
     (source (origin
               (method url-fetch)
               ;; The gem does not include the Rakefile, so we download the
@@ -3092,7 +3092,7 @@ access the result as a Nokogiri parsed document.")
               (file-name (string-append name "-" version ".tar.gz"))
               (sha256
                (base32
-                "055xnj38l60gxnnng76kpy2l2jbrp0byjdyq17jw79w7l4b40znr"))))
+                "1fmqppwif3cm8h79006jfzkdnlxxzlry9kzk03psk0d5xpg55ycc"))))
     (build-system ruby-build-system)
     (propagated-inputs
      `(("ruby-crass" ,ruby-crass)