build(deps-dev): update phpstan/phpstan requirement

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.0.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.66...1.12.6)

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

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

composer.json

@@ -25,7 +25,7 @@
 		"nette/neon": "~3.0",
 		"nextras/multi-query-parser": "1.0.0",
 		"phpstan/extension-installer": "1.3.1",
-		"phpstan/phpstan": "1.10.66",
+		"phpstan/phpstan": "1.12.6",
 		"phpstan/phpstan-deprecation-rules": "1.1.4",
 		"phpstan/phpstan-strict-rules": "1.5.2",
 		"symfony/config": "~4.4 || ~5.0",