Bump pocketmine/pocketmine-mp in the composer group across 1 directory

Bumps the composer group with 1 update in the / directory: [pocketmine/pocketmine-mp](https://github.com/pmmp/PocketMine-MP).


Updates `pocketmine/pocketmine-mp` from 5.41.1 to 5.42.1
- [Release notes](https://github.com/pmmp/PocketMine-MP/releases)
- [Commits](pmmp/PocketMine-MP@5.41.1...5.42.1)

---
updated-dependencies:
- dependency-name: pocketmine/pocketmine-mp
  dependency-version: 5.42.1
  dependency-type: direct:development
  dependency-group: composer
...

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Author: dependabot[bot]