hotfix: pin starlette dependency

[bhimrazy]

What does this PR do?

This PR pins the Starlette dependency to avoid the 0.46.0 release.

Context:
The latest version of Starlette (0.46.0) has issues with pickling payload data—
specifically, the error cannot pickle '_io.BufferedRandom' object

The root cause of the error will be addressed in a separate PR shortly.

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (90d7d10) to head (e99a5b3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #445   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        31     31           
  Lines      2041   2041           
===================================
  Hits       1824   1824           
  Misses      217    217           

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