Use keyword arguments for ApplicationService calls

Not all services are using keywords, which breaks those calls in Ruby 3

app/services/ldap_manager/update_avatar.rb

@@ -2,7 +2,7 @@ require "image_processing/vips"
 
 module LdapManager
   class UpdateAvatar < LdapManagerService
-    def initialize(dn, file)
+    def initialize(dn:, file:)
       @dn = dn
       @img_data = process(file)
     end