Replace logging.warn with logging.warning
This MR replaces all calls to logging.warn with ones to logging.warning; the former has been deprecated for 10 years, see
https://github.com/python/cpython/blob/3.6/Lib/logging/init.py#L1322-L1325.
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This MR replaces all calls to logging.warn with ones to logging.warning; the former has been deprecated for 10 years, see
https://github.com/python/cpython/blob/3.6/Lib/logging/init.py#L1322-L1325.