chore(deps): bump anstream in /staking-miner-playground (#941)

Bumps [anstream](https://github.com/rust-cli/anstyle) from 0.6.7 to 0.6.15.
- [Commits](rust-cli/anstyle@anstream-v0.6.7...anstream-v0.6.15)

---
updated-dependencies:
- dependency-name: anstream
  dependency-type: indirect
...

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

Author: dependabot[bot]