fix context to have new object for each request

[aniketmaurya]

What does this PR do?

Fixes #450

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (08a9caa) to head (8b79448).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #451   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        37     37           
  Lines      2153   2153           
===================================
  Hits       1909   1909           
  Misses      244    244           

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[bhimrazy]

Great catch, @aniketmaurya! 🚀
I didn’t knew they behave differently.

# All elements in the list will refer to the same dictionary object.
contexts = [{}] * num_inputs  

# vs 

# Each element will refer to a different dictionary object.
contexts = [{} for _ in range(num_inputs)]