testing/maddy: upgrade to 0.8.1

Connection from outlook starttls handshake failed on 0.7.1, upgrade to 0.8.1 resolves it.

assigned to @mpolanski

added 34 commits

• adba48ba...5a5974a5 - 33 commits from branch alpine:master
• 23c1081e - testing/maddy: upgrade to 0.8.1

Compare with previous version

merged

Thanks