Bump Sources/Copus from 8cf872a to 82ac57d

Bumps [Sources/Copus](https://github.com/xiph/opus) from `8cf872a` to `82ac57d`.
- [Release notes](https://github.com/xiph/opus/releases)
- [Commits](xiph/opus@8cf872a...82ac57d)

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

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

Author: dependabot[bot]