Update to 3.0.3.
- Update to 3.0.3, which contains an important security fix. The fix is not
embargoed but no CVE has been assigned yet.
- Drop patches merged upstream.
- An update of imaptest has resulted in three additional cassandane failures,
reported upstream as https://github.com/cyrusimap/cyrus-imapd/issues/2087.
In order to get the security fix out without delay, those three tests have been