Bug#973289: tight dependency on python3-pandas-lib (>= ${source:Version})

[Matthias Klose]

Package: src:pandas
Version: 1.1.3+dfsg-2

python3-pandas depends on

  python3-pandas-lib (>= ${source:Version}),

This makes the package uninstallable once a build for an architecture fails or
is late. It only works for binNMUs in Debian (Ubuntu is doing sourceful uploads
for transitions).  Is there a reason for that tight dependency, or could that be
relaxed a bit?