[typing] Fix typing errors for argument assignments in appendInStep (backport #5734)

[mergify]

Description

#Fixes #5733

---

This is an automatic backport of pull request #5734 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 4e9388e has failed:

On branch mergify/bp/2021/pr-5734
Your branch is up to date with 'origin/2021'.

You are currently cherry-picking commit 4e9388ed.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   src/abaqus/Interaction/ContactPropertyAssignment.py
	modified:   src/abaqus/Interaction/InitializationAssignment.py
	modified:   src/abaqus/Interaction/PolarityAssignments.py
	modified:   src/abaqus/Interaction/SlidingFormulationAssignment.py
	modified:   src/abaqus/Interaction/SlidingTransitionAssignment.py
	modified:   src/abaqus/Interaction/SmoothingAssignment.py
	modified:   src/abaqus/Interaction/StabilizationAssignment.py
	modified:   src/abaqus/Interaction/SurfaceBeamSmoothingAssignment.py
	modified:   src/abaqus/Interaction/SurfaceCrushTriggerAssignment.py
	modified:   src/abaqus/Interaction/SurfaceFrictionAssignment.py
	modified:   src/abaqus/Interaction/SurfaceOffsetAssignment.py
	modified:   src/abaqus/Interaction/SurfaceThicknessAssignment.py
	modified:   src/abaqus/Interaction/SurfaceVertexCriteriaAssignment.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/abaqus/Interaction/MasterSlaveAssignment.py
	both modified:   src/abaqus/Interaction/SurfaceFeatureAssignment.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[github-actions]

Hi @mergify[bot], I have deleted the conflicted deleted files in this pull request. Please check it again. Thanks!