Fixes #298: Repeatedly appending parent path to flatFiles

[mayank-singh-sikarwar]

Purpose: Fix for appending parent path to CSV file paths in cosmx.py reader module.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.15%. Comparing base (79e5f89) to head (0fab182).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spatialdata_io/readers/cosmx.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #305   +/-   ##
=======================================
  Coverage   62.15%   62.15%           
=======================================
  Files          27       27           
  Lines        3181     3181           
=======================================
  Hits         1977     1977           
  Misses       1204     1204           

Files with missing lines	Coverage Δ
src/spatialdata_io/readers/cosmx.py	18.18% <0.00%> (ø)

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[LucaMarconato]

Thanks @mayank-singh-sikarwar