composer(deps-dev): bump ergebnis/composer-normalize

Bumps [ergebnis/composer-normalize](https://github.com/ergebnis/composer-normalize) from 2.13.3 to 2.15.0.
- [Release notes](https://github.com/ergebnis/composer-normalize/releases)
- [Changelog](https://github.com/ergebnis/composer-normalize/blob/main/CHANGELOG.md)
- [Commits](ergebnis/composer-normalize@2.13.3...2.15.0)

---
updated-dependencies:
- dependency-name: ergebnis/composer-normalize
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

composer.json

@@ -23,7 +23,7 @@
     "ext-tokenizer": "*"
   },
   "require-dev": {
-    "ergebnis/composer-normalize": "^2.13.3",
+    "ergebnis/composer-normalize": "^2.15.0",
     "ergebnis/license": "^1.1.0",
     "ergebnis/php-cs-fixer-config": "^2.13.0",
     "ergebnis/phpstan-rules": "~0.15.3",