Remove deprecated iteritems() and use items() instead

[gaugup]

No description provided.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5547459) 87.70% compared to head (b699871) 87.70%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #560   +/-   ##
=======================================
  Coverage   87.70%   87.70%           
=======================================
  Files          62       62           
  Lines        4075     4075           
=======================================
  Hits         3574     3574           
  Misses        501      501           

Flag	Coverage Δ
unittests	87.70% <ø> (ø)

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