Bump OpenTimelineIO from 2a33b58 to abe8308

Bumps [OpenTimelineIO](https://github.com/PixarAnimationStudios/OpenTimelineIO) from `2a33b58` to `abe8308`.
- [Release notes](https://github.com/PixarAnimationStudios/OpenTimelineIO/releases)
- [Commits](AcademySoftwareFoundation/OpenTimelineIO@2a33b58...abe8308)

---
updated-dependencies:
- dependency-name: OpenTimelineIO
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>