Freeze structlog version

[tchaton]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #860 (e2f1709) into master (e8a64a0) will decrease coverage by 14.85%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #860       +/-   ##
===========================================
- Coverage   78.16%   63.31%   -14.86%     
===========================================
  Files         226      226               
  Lines       12355    12355               
===========================================
- Hits         9657     7822     -1835     
- Misses       2698     4533     +1835     

Flag	Coverage Δ
unittests	63.31% <ø> (-14.86%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/core/serve/dag/visualize.py	19.04% <0.00%> (-76.20%)	⬇️
flash/core/integrations/labelstudio/visualizer.py	22.00% <0.00%> (-74.00%)	⬇️
flash/core/serve/component.py	21.69% <0.00%> (-72.65%)	⬇️
...ash/pointcloud/segmentation/open3d_ml/backbones.py	20.83% <0.00%> (-70.84%)	⬇️
...ash/pointcloud/detection/open3d_ml/data_sources.py	23.93% <0.00%> (-66.67%)	⬇️
...tcloud/segmentation/open3d_ml/sequences_dataset.py	20.18% <0.00%> (-63.31%)	⬇️
flash/core/serve/interfaces/http.py	35.44% <0.00%> (-62.03%)	⬇️
flash/core/serve/flash_components.py	29.62% <0.00%> (-61.12%)	⬇️
flash/image/segmentation/backbones.py	41.17% <0.00%> (-58.83%)	⬇️
flash/core/serve/composition.py	42.25% <0.00%> (-57.75%)	⬇️
... and 78 more

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