Bump bitstream-io from 4.6.0 to 4.9.0 (#214)

Bumps [bitstream-io](https://github.com/tuffy/bitstream-io) from 4.6.0 to 4.9.0.
- [Changelog](https://github.com/tuffy/bitstream-io/blob/master/CHANGES.md)
- [Commits](tuffy/bitstream-io@v4.6.0...v4.9.0)

---
updated-dependencies:
- dependency-name: bitstream-io
  dependency-version: 4.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]