Bump Sources/Copus from 101a71e to 5854a9f

Bumps [Sources/Copus](https://github.com/xiph/opus) from `101a71e` to `5854a9f`.
- [Release notes](https://github.com/xiph/opus/releases)
- [Commits](xiph/opus@101a71e...5854a9f)

---
updated-dependencies:
- dependency-name: Sources/Copus
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]