[QA] Adding --trace-malloc

[Lucas-C]

Helps investigation made in #641

[codecov]

Codecov Report

Base: 93.93% // Head: 93.77% // Decreases project coverage by -0.17% ⚠️

Coverage data is based on head (2e528bc) compared to base (e4b5b3e).
Patch coverage: 76.47% of modified lines in pull request are covered.

❗ Current head 2e528bc differs from pull request most recent head f46157f. Consider uploading reports for the commit f46157f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #699      +/-   ##
==========================================
- Coverage   93.93%   93.77%   -0.17%     
==========================================
  Files          26       26              
  Lines        6780     6829      +49     
  Branches     1206     1216      +10     
==========================================
+ Hits         6369     6404      +35     
- Misses        242      251       +9     
- Partials      169      174       +5     

Impacted Files	Coverage Δ
fpdf/image_parsing.py	83.33% <76.47%> (-5.17%)	⬇️

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