[Temporary fix] Pin flytekit version for single binary builds

[pmahindrakar-oss]

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• I updated the documentation accordingly.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.32%. Comparing base (66ff152) to head (f19943b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5798   +/-   ##
=======================================
  Coverage   36.31%   36.32%           
=======================================
  Files        1304     1304           
  Lines      110048   110048           
=======================================
+ Hits        39964    39970    +6     
+ Misses      65928    65922    -6     
  Partials     4156     4156           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.61% <ø> (+0.03%)	⬆️
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.21% <ø> (ø)
unittests-flyteidl	7.12% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	41.93% <ø> (ø)
unittests-flytestdlib	55.37% <ø> (ø)

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