Update Flowkit to v2.3.5

[jribbink]

Closes #1961

Description

Updates flowkit to v2.3.5 which has a patch change for contract deployment arguments to allow empty args when updating a contract.

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.81%. Comparing base (09bd97b) to head (50ee974).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1968   +/-   ##
=======================================
  Coverage   25.81%   25.81%           
=======================================
  Files          96       96           
  Lines        6644     6644           
=======================================
  Hits         1715     1715           
  Misses       4753     4753           
  Partials      176      176           

Flag	Coverage Δ
unittests	25.81% <ø> (ø)

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