Fix flake8 errors in the CI

[caponetto]

What changes were proposed in this pull request?

This PR fixes the failures in the CI after a new release of the flake8-import-order package.

How was this pull request tested?

Through CI runs.

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@0758335). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
elyra/pipeline/properties.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3315   +/-   ##
=======================================
  Coverage        ?   83.71%           
=======================================
  Files           ?      158           
  Lines           ?    19939           
  Branches        ?      498           
=======================================
  Hits            ?    16692           
  Misses          ?     3062           
  Partials        ?      185           

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