Bump pocketmine/nbt from 0.3.2 to 0.3.4

Bumps [pocketmine/nbt](https://github.com/pmmp/NBT) from 0.3.2 to 0.3.4.
- [Release notes](https://github.com/pmmp/NBT/releases)
- [Commits](pmmp/NBT@0.3.2...0.3.4)

---
updated-dependencies:
- dependency-name: pocketmine/nbt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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