[9.18] Bump the requirement in dnstap test to dnspython 2.0.0
The dnspython.Resolve.resolve() requires at least dnspython >= 2.0.0, this wasn't enforced in the dnstap system test.
Backport of MR !7793 (merged)
Edited by Ondřej Surý
The dnspython.Resolve.resolve() requires at least dnspython >= 2.0.0, this wasn't enforced in the dnstap system test.
Backport of MR !7793 (merged)