Bug#988142: pandas FTBFS in buster: test failures

[Rebecca N. Palmer]

This is _probably_ the same issue that 0.23.3+dfsg-3 has had since it 
was new: some tests run in all installed locales, and on 
reproducible-builds (but not buildds without a locales-all dependency) 
this includes a few with no text encoding.

The underlying issue is in Python stdlib, and is an exception (not a 
wrong answer).  The 'fix' in -4 was to ignore the affected tests.
https://salsa.debian.org/science-team/pandas/-/commit/da7f8469cdf96b0da87db87ea1741e180cee7656

Hence, I currently do not intend to attempt a fix in stable, but am open 
to discussion of this.