[pan] fix (gitlab ci): use libenchant-2-dev

[Dominique Dumont <ddumont src gnome org>]

commit 3d6f401dc3f1f60a1572e08aa0c49c47024fa135
Author: Dominique Dumont <dod debian org>
Date:   Wed Sep 1 17:39:43 2021 +0200

    fix (gitlab ci): use libenchant-2-dev
    
    libenchant-dev is no longer available

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2630f98c..d25bed41 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,7 +15,7 @@ build-ubuntu-gtk2:
         libgtk2.0-dev
         libgmime-3.0-dev
         libgtkspell-dev
-        libenchant-dev
+        libenchant-2-dev
         libnotify-dev
         gnome-keyring
         libgnutls28-dev