Update dependency phpstan/phpstan to ^1.12.6

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpstan/phpstan | 1.12.5 | 1.12.6 |

Author: renovate[bot]

composer.json

@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": "~8.3.0 || ~8.4.0",
-        "phpstan/phpstan": "^1.12.5"
+        "phpstan/phpstan": "^1.12.6"
     },
     "require-dev": {
         "nette/di": "^3.2.3",