Regenerated Excel files to Suppress Openpyxl Warnings

[WillAyd]

As noticed by @jorisvandenbossche openpyxl was throwing some warnings for excel files in the test suite. The warnings did not appear relevant to the data within the files and are most likely historical artifacts of how the files were created. Simply resaving these removes the warning from the builds

pandas/tests/io/excel/test_readers.py::TestReaders::test_reader_special_dtypes[openpyxl-.xlsx]
pandas/tests/io/excel/test_readers.py::TestReaders::test_reader_special_dtypes[openpyxl-.xlsm]
pandas/tests/io/excel/test_readers.py::TestReaders::test_reading_all_sheets[openpyxl-.xlsx]
pandas/tests/io/excel/test_readers.py::TestReaders::test_reading_all_sheets[openpyxl-.xlsm]
pandas/tests/io/excel/test_readers.py::TestReaders::test_reading_multiple_specific_sheets[openpyxl-.xlsx]
pandas/tests/io/excel/test_readers.py::TestReaders::test_reading_multiple_specific_sheets[openpyxl-.xlsm]
pandas/tests/io/excel/test_readers.py::TestReaders::test_read_excel_squeeze[openpyxl-.xlsx]
pandas/tests/io/excel/test_readers.py::TestReaders::test_read_excel_squeeze[openpyxl-.xlsm]
pandas/tests/io/excel/test_readers.py::TestExcelFileRead::test_excel_passes_na[openpyxl-.xlsx]
pandas/tests/io/excel/test_readers.py::TestExcelFileRead::test_excel_passes_na[openpyxl-.xlsm]
  /Users/williamayd/miniconda3/envs/pandas-dev/lib/python3.7/site-packages/openpyxl/worksheet/_reader.py:296: UserWarning: Unknown extension is not supported and will be removed

[jorisvandenbossche]

Super, can confirm the warnings are gone