These fixes are all applied in ISPConfig 2.2.12, but you may check the files yourself.
I wonder if it is possible to run the updates as the admispconfig user or some other user without a quota?
Thats not a quota problem of the quota during updates. The updates are always run by a user without quota. The problem is that clamav seems to refuse the updated databases on your server and then loads a new database under the owner of the mailbox.
I use ISPConfig 2.2.12 under sarge here too and I dont get any tmp files from clamav.