CI: value_counts tests failing sometimes

[dsaxton]

It seems like we're getting some failures from test_value_counts_unique_nunique in pandas/tests/base/test_ops.py (weird thing is that it only fails some of the time; maybe because of randomized test data?). Looks like these tests were updated in #32046; @SaturnFromTitan any ideas what might be happening there?

Sample failed pipeline: https://github.com/pandas-dev/pandas/runs/464853016

[SaturnFromTitan]

Hm, that's weird. Looking at the error log above the test failed for the fixture value float16-series defined here.

If I recall correctly that fixture value wasn't used/tested in this test before. So possibly we can just remove it from the fixture again. I have no idea about why it's flaky/broken though...

[WillAyd]

We generally don’t support float16 so if it is causing test failures can probably remove

[SaturnFromTitan]

xref: #32205

[SaturnFromTitan]

take