Bump xstream from 1.4.15 to 1.4.16 (#197)

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.15 to 1.4.16.
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

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

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