Security update for dovecot23

This update for dovecot23 fixes the following issues:

- CVE-2020-12673: improper implementation of NTLM does not check message buffer size (bsc#1174922).
- CVE-2020-12674: improper implementation of RPA mechanism (bsc#1174923).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1174922
VUL-0: CVE-2020-12673: dovecot22,dovecot23: improper implementation of NTLM does not check message buffer size
bnc#1174923
VUL-0: CVE-2020-12674: dovecot22,dovecot23: improper implementation of RPA mechanism
Selected Binaries
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