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

Updates the requirements on [phpstan/phpstan-strict-rules](https://github.com/phpstan/phpstan-strict-rules) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan-strict-rules/releases)
- [Commits](phpstan/phpstan-strict-rules@0.12.5...0.12.7)

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

composer.json

@@ -40,7 +40,7 @@
 		"phpstan/phpstan-deprecation-rules": "0.12.5",
 		"phpstan/phpstan-nette": "0.12.11",
 		"phpstan/phpstan-mockery": "0.12.7",
-		"phpstan/phpstan-strict-rules": "0.12.5",
+		"phpstan/phpstan-strict-rules": "0.12.7",
 		"nextras/orm-phpstan": "dev-master",
 		"marc-mabe/php-enum-phpstan": "dev-master",
 		"tracy/tracy": "~2.3"