Remove some DeprecationWarnings

[EvanBldy]

Summarize your change.

During the tests some DeprecationWarnings pop up. I only fix them.

Reference associated tests.

For example here you see the DeprecationWarnings : https://github.com/AcademySoftwareFoundation/OpenTimelineIO/actions/runs/7483248301/job/20368203066?pr=1669#step:9:18

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d98f657) 79.84% compared to head (0f79837) 79.84%.

Additional details and impacted files

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[jminor]

From meeting discussion: we plan to land this and then copy it over into the new FCP XML adapter repo.