build(deps-dev): update mediawiki/mediawiki-codesniffer requirement (#10)

Updates the requirements on [mediawiki/mediawiki-codesniffer](https://github.com/wikimedia/mediawiki-tools-codesniffer) to permit the latest version.
- [Changelog](https://github.com/wikimedia/mediawiki-tools-codesniffer/blob/master/HISTORY.md)
- [Commits](wikimedia/mediawiki-tools-codesniffer@v49.0.0...v50.0.0)

---
updated-dependencies:
- dependency-name: mediawiki/mediawiki-codesniffer
  dependency-version: 50.0.0
  dependency-type: direct:development
...

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Author: dependabot[bot]

composer.json

@@ -10,7 +10,7 @@
         }
     ],
     "require-dev": {
-        "mediawiki/mediawiki-codesniffer": "^49.0",
+        "mediawiki/mediawiki-codesniffer": "^50.0",
         "php-parallel-lint/php-parallel-lint": "^1.4",
         "mediawiki/minus-x": "^1.1"
     },