bsddb3 is deprecated

[kev009]

According to https://www.jcea.es/programacion/pybsddb.htm bsddb3 is deprecated and replaced by the PyPI berkeleydb package. It seems a somewhat simple name change, but there is also this: The main change you need to be aware is that in berkeleydb keys and values are now bytes, while in bsddb3 they were strings. One other difficulty will be Debian packaging, Debian has not yet packaged python3-berkeleydb.

X-ref: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262203