Request for longer response to make cache test more robust.

[ekzhu]

Why are these changes needed?

Avoid cache test failure like this one: https://github.com/microsoft/autogen/actions/runs/8312062884/job/22746520649?pr=2040

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.90%. Comparing base (448736e) to head (603489a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2043   +/-   ##
=======================================
  Coverage   36.90%   36.90%           
=======================================
  Files          66       66           
  Lines        7031     7031           
  Branches     1538     1538           
=======================================
  Hits         2595     2595           
  Misses       4210     4210           
  Partials      226      226           

Flag	Coverage Δ
unittests	36.90% <ø> (ø)

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