Update phpstan/phpstan requirement from ^0.11.5 to ^0.11.5 || ^0.12.0

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@0.11.5...0.12.32)

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

Author: dependabot[bot]

composer.json

@@ -18,7 +18,7 @@
     },
     "require-dev": {
         "phpro/grumphp": "^0.17.1 || ^0.19.0",
-        "phpstan/phpstan": "^0.11.5",
+        "phpstan/phpstan": "^0.11.5 || ^0.12.0",
         "phpunit/phpunit": "^8.0 || ^9.0",
         "squizlabs/php_codesniffer": "^3.4",
         "symfony/var-dumper": "^4.2 || ^5.0"