Bump pocketmine/pocketmine-mp from 5.8.2 to 5.9.0

Bumps [pocketmine/pocketmine-mp](https://github.com/pmmp/PocketMine-MP) from 5.8.2 to 5.9.0.
- [Release notes](https://github.com/pmmp/PocketMine-MP/releases)
- [Commits](pmmp/PocketMine-MP@5.8.2...5.9.0)

---
updated-dependencies:
- dependency-name: pocketmine/pocketmine-mp
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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