Update spatie/ignition requirement from ^1.14 to ^1.15

Updates the requirements on [spatie/ignition](https://github.com/spatie/ignition) to permit the latest version.
- [Release notes](https://github.com/spatie/ignition/releases)
- [Changelog](https://github.com/spatie/ignition/blob/main/CHANGELOG.md)
- [Commits](spatie/ignition@1.14.0...1.15.0)

---
updated-dependencies:
- dependency-name: spatie/ignition
  dependency-type: direct:development
...

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

composer.json

@@ -33,7 +33,7 @@
         "phpstan/phpstan": "^1.11",
         "phpstan/phpstan-phpunit": "^1.4",
         "phpunit/phpunit": "^10.5",
-        "spatie/ignition": "^1.14",
+        "spatie/ignition": "^1.15",
         "symfony/var-dumper": "^7.1",
         "vimeo/psalm": "^5.24"
     },