Bump phpstan to 1.12.x

Signed-off-by: Matthew Peveler <matt.peveler@gmail.com>

Author: MasterOdin

composer.json

@@ -74,7 +74,7 @@
         "cs-check": "phpcs",
         "cs-fix": "phpcbf",
         "stan": "phpstan analyse",
-        "stan-setup": "cp composer.json composer.backup && composer require --dev phpstan/phpstan:~1.9.0 && mv composer.backup composer.json",
+        "stan-setup": "cp composer.json composer.backup && composer require --dev phpstan/phpstan:~1.12.0 && mv composer.backup composer.json",
         "lowest": "validate-prefer-lowest",
         "lowest-setup": "composer update --prefer-lowest --prefer-stable --prefer-dist --no-interaction && cp composer.json composer.backup && composer require --dev dereuromark/composer-prefer-lowest && mv composer.backup composer.json",
         "test": "phpunit --colors=always"