fix: unpin lxml constraint

[irtazaakram]

• Related to Study and fix crash on updating lxml==5.1.0 xblock-sdk#347

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.47%. Comparing base (cc5484d) to head (ad9c372).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #81   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files           5        5           
  Lines         226      226           
=======================================
  Hits          209      209           
  Misses         17       17           

Flag	Coverage Δ
unittests	92.47% <ø> (ø)

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