Update phpstan/phpstan requirement from ^0.12.88 to ^0.12.88 || ^1.0.0

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.12.88...1.0.0)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

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

composer.json

@@ -28,7 +28,7 @@
     "require-dev": {
         "phpunit/phpunit": ">=7.0",
         "phpmd/phpmd": "2.*",
-        "phpstan/phpstan": "^0.12.88"
+        "phpstan/phpstan": "^0.12.88 || ^1.0.0"
     },
     "suggest": {
         "ext-gd": "Required to add images"