CI: test_drop_duplicates_categorical_non_bool is flaky

[jschendel]

I've noticed recently that the xfailed part of the following test is occasionally xpassing, which is causing the test suite to fail due to being strict with xpass:

pandas/pandas/tests/series/test_analytics.py

Lines 1405 to 1412 in 90a85e0

	@pytest.mark.parametrize(
	"dtype",
	["int_", "uint", "float_", "unicode_", "timedelta64[h]",
	pytest.param("datetime64[D]",
	marks=pytest.mark.xfail(reason="GH#7996"))]
	)
	@pytest.mark.parametrize("is_ordered", [True, False])
	def test_drop_duplicates_categorical_non_bool(self, dtype, is_ordered):

The quick fix is to update the xfail with strict=False but additional investigation into why this is occasionally passing would also be appreciated.

Examples of the xpass:

• Select Attempt # 1 here: https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=10441&view=logs
• https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=10459&view=logs&jobId=521b7dfd-2989-5ff8-bc8c-7481906480fa&taskId=07b8d9d4-6363-5e2d-bc2b-146a30521256&lineStart=64&lineEnd=70&colStart=1&colEnd=24

[mroeschke]

Looks like we no longer have an xfail on the parameter. Closing.