gnu: ruby: Update to 2.7.2.

Fixes CVE-2020-25613.

* gnu/packages/ruby.scm (ruby): Update to 2.7.2.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/ruby.scm

@@ -147,16 +147,16 @@ (define-public ruby
 (define-public ruby-2.7
   (package
     (inherit ruby)
-    (version "2.7.1")
+    (version "2.7.2")
     (source
      (origin
        (method url-fetch)
-       (uri (string-append "http://cache.ruby-lang.org/pub/ruby/"
+       (uri (string-append "https://cache.ruby-lang.org/pub/ruby/"
                            (version-major+minor version)
                            "/ruby-" version ".tar.gz"))
        (sha256
         (base32
-         "0674x98f542y02r7n2yv2qhmh97blqhi2mvh2dn5f000vlxlh66l"))
+         "1m63461mxi3fg4y3bspbgmb0ckbbb1ldgf9xi0piwkpfsk80cmvf"))
        (modules '((guix build utils)))
        (snippet `(begin
                    ;; Remove bundled libffi