gnu: ruby-json-pure: Update to 2.6.3.

* gnu/packages/ruby.scm (ruby-json-pure): Update to 2.6.3.
[source]: Use git repository.
[arguments]: Update style.
[home-page]: Update.

gnu/packages/ruby.scm

@@ -7642,17 +7642,23 @@ a native C extension.")
 (define-public ruby-json-pure
   (package
     (name "ruby-json-pure")
-    (version "2.3.1")
-    (source (origin
-              (method url-fetch)
-              (uri (rubygems-uri "json_pure" version))
+    (version "2.6.3")
+    (source
+     (origin
+       ;; For tests
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/flori/json.git")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
        (sha256
         (base32
-                "00pziwkfqwk8vj19s65sdki31q1wvmf5v9b3sfglxm94qfvas1lx"))))
+         "0551269c98a07m6bl594syh5vknrm3c636a4dxis9jpsb7vf7lfx"))))
     (build-system ruby-build-system)
     (arguments
-     `(#:phases
-       (modify-phases %standard-phases
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
           (add-after 'unpack 'fix-rakefile
             (lambda _
               (substitute* "Rakefile"
@@ -7663,7 +7669,7 @@ a native C extension.")
     (synopsis "JSON implementation in pure Ruby")
     (description
      "This package provides a JSON implementation written in pure Ruby.")
-    (home-page "https://flori.github.com/json/")
+    (home-page "https://flori.github.io/json/")
     (license license:ruby)))
 
 (define-public ruby-jwt