Bump slim/slim from 4.12.0 to 4.13.0

Bumps [slim/slim](https://github.com/slimphp/Slim) from 4.12.0 to 4.13.0.
- [Release notes](https://github.com/slimphp/Slim/releases)
- [Changelog](https://github.com/slimphp/Slim/blob/4.x/CHANGELOG.md)
- [Commits](slimphp/Slim@4.12.0...4.13.0)

---
updated-dependencies:
- dependency-name: slim/slim
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

composer.json

@@ -32,7 +32,7 @@
         "react/mysql": "^0.6.0",
         "react/react": "^v1.4.0",
         "slim/psr7": "^1.5",
-        "slim/slim": "^4.10",
+        "slim/slim": "^4.13",
         "vlucas/phpdotenv": "^5.5",
         "ext-openssl": "*",
         "firebase/php-jwt": "*"