fix: Starlette dependency issue

[deependujha]

What does this PR do?

Fixes #443

update max_file_size to spool_max_size

Starlette changed max_file_size name. check pr: Kludex/starlette#2780

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• Did you make sure to update the docs?
• Did you write any new necessary tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (ec10c15) to head (1fb08ca).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #456   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        37     37           
  Lines      2153   2155    +2     
===================================
+ Hits       1909   1911    +2     
  Misses      244    244           

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[aniketmaurya]

Great job @deependujha 👏 ! thanks for the fix.

[bhimrazy]

Congratulations, @deependujha, on landing the first PR to LitServe! 🚀
Let's gooo 🔥🚀