[Bug]: otio_reader.py using deprecated method

[markreidvfx]

What happened?

OpenTimeline v0.16.0+ changed the name of the following methods

clip_if() -> find_clips() children_if -> find_children()

https://github.com/AcademySoftwareFoundation/OpenTimelineIO/pull/1541

The otio plugin is using the old method name.

I think the only occurrence is here: https://github.com/AcademySoftwareFoundation/OpenRV/blob/cebead24b7befa5110b3a504b5b69ed83c43015e/src/plugins/rv-packages/otio_reader/otio_reader.py#L284

List all the operating systems versions where this is happening

n/a

On what computer hardware is this happening?

n/a

Relevant console log output

No response

Environment variables

No response

Extra information

No response

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