build(deps-dev): update mediawiki/mediawiki-phan-config requirement

Updates the requirements on [mediawiki/mediawiki-phan-config](https://github.com/wikimedia/mediawiki-tools-phan) to permit the latest version.
- [Changelog](https://github.com/wikimedia/mediawiki-tools-phan/blob/master/HISTORY.md)
- [Commits](wikimedia/mediawiki-tools-phan@0.15.0...0.15.1)

---
updated-dependencies:
- dependency-name: mediawiki/mediawiki-phan-config
  dependency-type: direct:development
...

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

composer.json

@@ -26,7 +26,7 @@
 	},
 	"require-dev": {
 		"mediawiki/mediawiki-codesniffer": "45.0.0",
-		"mediawiki/mediawiki-phan-config": "0.15.0",
+		"mediawiki/mediawiki-phan-config": "0.15.1",
 		"mediawiki/minus-x": "1.1.3",
 		"php-parallel-lint/php-console-highlighter": "1.0.0",
 		"php-parallel-lint/php-parallel-lint": "1.4.0"