gnu: mutt: Update to 2.2.12 [security fixes].

Fixes CVE-2023-4874 and CVE-2023-4875.  See
http://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20230904/000056.html

* gnu/packages/mail.scm (mutt): Update to 2.2.12

Signed-off-by: Tobias Geerinckx-Rice <me@tobias.gr>

gnu/packages/mail.scm

@@ -600,7 +600,7 @@ aliasing facilities to work just as they would on normal mail.")
 (define-public mutt
   (package
     (name "mutt")
-    (version "2.2.10")
+    (version "2.2.12")
     (source (origin
              (method url-fetch)
              (uri (list
@@ -610,7 +610,7 @@ aliasing facilities to work just as they would on normal mail.")
                                    version ".tar.gz")))
              (sha256
               (base32
-               "121xrns9b0n5cdjb7nv5a6idjjk58pp7pdclgdphjy9g88i3yxsd"))
+               "0f6f32xlfp36axj5in8b0fcc9m05la27zxqbzpvmd3jbyq9g6fh4"))
              (patches (search-patches "mutt-store-references.patch"))))
     (build-system gnu-build-system)
     (inputs