fix: Incorrect endpoint in UploadStrings method

[Seppe-Ottevaere]

Fixed endpoint url #343

[andrii-bodnar]

@Seppe-Ottevaere thank you! Please address the failed CI/CD checks

[andrii-bodnar]

@Seppe-Ottevaere please also update the respective test case

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.56%. Comparing base (f45d418) to head (abd6d69).
⚠️ Report is 171 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #344       +/-   ##
===========================================
+ Coverage   50.38%   67.56%   +17.18%     
===========================================
  Files         277      435      +158     
  Lines        3688     6738     +3050     
  Branches        0      555      +555     
===========================================
+ Hits         1858     4552     +2694     
- Misses       1830     2137      +307     
- Partials        0       49       +49     

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