bug fix: correct operation name

[DyfanJones]

Following methods returned unpopulated lists:
- list_multipart_uploads
- list_parts
Addresses Issue: #608

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (af2c5d3) 83.94% compared to head (6fca8bb) 83.97%.

❗ Current head 6fca8bb differs from pull request most recent head d4cb4ca. Consider uploading reports for the commit d4cb4ca to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #609      +/-   ##
==========================================
+ Coverage   83.94%   83.97%   +0.02%     
==========================================
  Files          63       63              
  Lines        4185     4186       +1     
==========================================
+ Hits         3513     3515       +2     
+ Misses        672      671       -1     

see 126 files with indirect coverage changes

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