CI: pandas warnings in tests about keyword only arguments

[TomAugspurger]

e.g. https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=32821&view=logs&j=76104ccd-8dcc-5006-a17c-28bcdd709542&t=cd420693-444f-5c55-14e0-1be238e189a1

pandas\tests\io\test_html.py:886
  D:\a\1\s\pandas\tests\io\test_html.py:886: FutureWarning: Starting with Pandas version 2.0 all arguments of read_html except for the argument 'io' will be keyword-only
    result = self.read_html(data, "Arizona", index_col=0)[0]

We'll need to track down places where we're passing positional arguments like

pandas/pandas/tests/io/test_html.py

Line 886 in def6f6d

result = self.read_html(data, "Arizona", index_col=0)[0]

and update them to use keyword arguments. That may be the only one, not sure.