Bump ergebnis/composer-normalize from 2.5.1 to 2.6.0 in /dev-tools

Bumps [ergebnis/composer-normalize](https://github.com/ergebnis/composer-normalize) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/ergebnis/composer-normalize/releases)
- [Changelog](https://github.com/ergebnis/composer-normalize/blob/main/CHANGELOG.md)
- [Commits](ergebnis/composer-normalize@2.5.1...2.6.0)

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

dev-tools/composer.json

@@ -1,6 +1,6 @@
 {
     "require-dev": {
-        "ergebnis/composer-normalize": "^2.5.1",
+        "ergebnis/composer-normalize": "^2.6.0",
         "friendsofphp/php-cs-fixer": "^2.16.4",
         "kubawerlos/php-cs-fixer-custom-fixers": "^2.2.1",
         "maglnet/composer-require-checker": "^2.1.0",