gnu: dovecot-trees: Update to 2.1.0.

* gnu/packages/mail.scm (dovecot-trees): Update to 2.1.0.
(source): Change to use 'url-fetch'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/mail.scm

@@ -1132,21 +1132,18 @@ It supports mbox/Maildir and its own dbox/mdbox formats.")
     (license (list lgpl2.1 license:expat (non-copyleft "file://COPYING")))))
 
 (define-public dovecot-trees
-  (let ((commit "006059c8a47d68f14f73c09743e45b9a73014dbf")
-        (revision "1"))
   (package
     (name "dovecot-trees")
-      (version (string-append "2.0.0-" revision "." (string-take commit 7)))
+    (version "2.1.0")
     (source
      (origin
-         (method git-fetch)
-         (uri (git-reference
-               (url "https://0xacab.org/riseuplabs/trees.git")
-               (commit commit)))
-         (file-name (string-append name "-" version "-checkout"))
+       (method url-fetch)
+       (uri (string-append "https://0xacab.org/riseuplabs/trees/repository/"
+                           "archive.tar.gz?ref=v" version))
+       (file-name (string-append name "-" version ".tar.gz"))
        (sha256
         (base32
-           "0ax90bzc66x179wi1m7ywqwa8nssyhjngs7ij109hqqxg5ymfp73"))))
+         "0rkk10b1bsjz979sc864vpgcdchy7yxwmyv4ik50lar1h6awdnrf"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("automake" ,automake)
@@ -1185,7 +1182,7 @@ How it works:
 using lidsodium sealed boxes.
 @item New mail is encrypted as it arrives using the Curve25519 public key.
 @end enumerate\n")
-      (license agpl3))))
+    (license agpl3)))
 
 (define-public dovecot-libsodium-plugin
   (let ((commit "044de73c01c35385df0105f6b387bec5d5317ce7")