table_to_parquet() can now convert files with uppercase extensions

[ddotta]

No description provided.

[ddotta]

@nbc a quick PR because some users urgently need to convert SAS files with extensions written in uppercase.
As a result, I went for the simplest and most urgent solution, due to lack of time.
Are you ok?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.52%. Comparing base (f17e000) to head (1580353).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   99.72%   97.52%   -2.21%     
==========================================
  Files          16       16              
  Lines         363      363              
==========================================
- Hits          362      354       -8     
- Misses          1        9       +8     

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