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)
- [Commits](phpstan/phpstan@0.12.18...0.12.32)

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

composer.json

@@ -22,7 +22,7 @@
 		"nette/utils": "~3.0",
 		"nette/finder": "~2.5",
 		"nette/neon": "~3.0",
-		"phpstan/phpstan": "0.12.18",
+		"phpstan/phpstan": "0.12.32",
 		"phpstan/phpstan-deprecation-rules": "0.12.4",
 		"phpstan/extension-installer": "~1.0",
 		"symfony/config": "~4.4 || ~5.0",