Adjust Python packages installed on Debian
The python-dnspython package was dropped from Debian "sid" and thus can no longer be installed on that system. Since this move is a part of a larger initiative to remove Python 2 from Debian, there is little sense in trying to implement Dockerfile workarounds for this specific package. Instead, remove Python 2 packages from all our Debian Docker images except the "buster" one (to retain some Python 2 test coverage for BIND branches other than "master").
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