gnu: dovecot: Update to 2.2.27.

* gnu/packages/mail.scm (dovecot): Update to 2.2.27.
[source, home-page]: Use HTTPS.

gnu/packages/mail.scm

@@ -933,15 +933,15 @@ facilities for checking incoming mail.")
 (define-public dovecot
   (package
     (name "dovecot")
-    (version "2.2.26.0")
+    (version "2.2.27")
     (source
      (origin
        (method url-fetch)
-       (uri (string-append "http://www.dovecot.org/releases/"
+       (uri (string-append "https://www.dovecot.org/releases/"
                            (version-major+minor version) "/"
                            name "-" version ".tar.gz"))
        (sha256 (base32
-                "01bgj8b2whi35ghbxb19nmr3xvx2zgjzxxw1crgx2v73kprs34pn"))))
+                "1s8qvr6fa9d0n179kdwgpsi72zkvpbh9q57q8fr2fjysgjl94zw9"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)))
@@ -973,7 +973,7 @@ facilities for checking incoming mail.")
                        (("/bin/cat") (which "cat"))
                        (("/bin/false") (which "false")))
                      #t)))))
-    (home-page "http://www.dovecot.org")
+    (home-page "https://www.dovecot.org")
     (synopsis "Secure POP3/IMAP server")
     (description
      "Dovecot is a mail server whose major goals are security and reliability.