Branches/1.9.0 2 deb10

Markus Koschanyrequested to merge
apo/unbound:branches/1.9.0-2_deb10 into branches/1.9.0-2_deb10

As previously discussed on the debian-lts mailing list, I have prepared a new Buster update of unbound to address the instability bug #962459 and I suggest to upload this version to buster via a buster-pu. The upgrade to 1.9.6 is necessary because no targeted fix could be found.

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