So we install 0.3.0.9-1~d90.stretch+1 (from deb.t.b.o) instead of
0.3.0.9-1~d99.buster+1 (from deb.tp.o, or rather our snapshot of it
which incorrectly has this Debian buster version of the package,
refs: #13413).

Will-fix: #13253