build: update composer.json

Author: ThorstenSuckow

composer.json

@@ -12,8 +12,8 @@
         "php": ">=7.4",
         "ezyang/htmlpurifier": "^4.11",
         "laravel/lumen-framework": "5.8.*",
-        "pear-pear.horde.org/horde_imap_client": "*",
-        "pear-pear.horde.org/horde_smtp": "*"
+        "pear-pear.horde.org/horde_imap_client": "2.30.*",
+        "pear-pear.horde.org/horde_smtp": "1.9.*"
     },
     "require-dev": {
         "fakerphp/faker": "^1.9.1",