updates scikit to 0.23.2

[srhrshr]

@desilinguist , this closes #630. Will update this PR with local nose test results to double check that there aren't any regressions.

[srhrshr]

Ran into 1 nosetests error due to a module root issue, and the sys.path insertion commit fixes it. All good now.

Traceback (most recent call last):
  File "--------------/skll/examples/make_titanic_example_data.py", line 15, in <module>
    from skll.data import Reader, Writer
ModuleNotFoundError: No module named 'skll'
Retrieving boston data from servers...done
Writing training and testing files...done
Retrieving iris data from servers...done
Writing training and testing files...done
E
======================================================================
ERROR: Run all of the configuration files for the titanic example
----------------------------------------------------------------------
Traceback (most recent call last):
  File "........../.pyenv/versions/3.6.9/envs/skll-0.23.2/lib/python3.6/site-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "...............skll/tests/test_examples.py", line 133, in test_titanic_configs
    run_configuration_and_check_outputs(config_path)
  File "...............skll/tests/test_examples.py", line 48, in run_configuration_and_check_outputs
    results_json_path = run_configuration(config_path, local=True, quiet=True)[0]
  File "...............skll/skll/experiments/__init__.py", line 570, in run_configuration
    log_level=log_level)
  File "...............skll/skll/config/__init__.py", line 628, in parse_config_file
    train_path = locate_file(train_path, config_dir)
  File "...............skll/skll/config/utils.py", line 106, in locate_file
    raise IOError(errno.ENOENT, "File does not exist", path_to_check)
FileNotFoundError: [Errno 2] File does not exist: '...............skll/tests/other/titanic/train+dev' ```

[codecov[bot]]

Codecov Report

Merging #632 into main will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #632   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files          27       27           
  Lines        3083     3083           
=======================================
  Hits         2932     2932           
  Misses        151      151           

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[mulhod]

@srhrshr Thanks for the PR, by the way! It's much appreciated. I just had a couple comments about relaxing the requirement so that it includes 0.23.2 but doesn't exclude 0.23.1.