Bump pocketmine/pocketmine-mp from 4.12.8 to 4.12.9

Bumps [pocketmine/pocketmine-mp](https://github.com/pmmp/PocketMine-MP) from 4.12.8 to 4.12.9.
- [Release notes](https://github.com/pmmp/PocketMine-MP/releases)
- [Commits](pmmp/PocketMine-MP@4.12.8...4.12.9)

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

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

composer.json

@@ -6,7 +6,7 @@
     "license": "LGPL-2.1",
     "require": {
         "php": "^8.0",
-        "pocketmine/pocketmine-mp": "4.12.8"
+        "pocketmine/pocketmine-mp": "4.12.9"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "v3.13.2",