Fix update_model function

[michael-bentz]

What does this change do?

Fixes the update_model function.

Why was this change made?

Passing kwargs as the last parameter was causing update_model to not behave as expected when not explicitly setting pk_field.

Verification

1. Verify that all automated tests pass
2. Debug and step through test_orm to make sure the logic is sound

• Verify the thing does this: ...
• Verify the thing does not do that: ...

Affirmations

All of these should have a check by them. Any exception requires an explanation.

• I have added docstrings with details on keyword arguments to new functions following the convention detailed in this gist
• I have added type hinting to new function parameters.
• I have added tests to new functions, following the rules of F.I.R.S.T..
• I matched the style of the existing code.
• I added and updated any relevant documentation (inline, README, CHANGELOG, and such).
• I used Python's type hinting.
• I ran the automated tests and ensured they ALL passed.
• I ran the linter and ensured my changes have not introduced ANY warnings or errors.
• I have made an effort to minimize code changes and have not included any cruft (preference files, *.pyc files, old comments, print-debugging, unused variables).
• I have made an effort maintain a clear commit history (haven't merged other branches or rebased improperly).
• I have written the code myself or have given credit where credit is due.

[saipavan10-git]

Reviewed the changes and ran the test debugger on test_orm.py. The code works as expected.