Update phpstan/phpstan-strict-rules requirement from 0.12.2 to 0.12.4

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@0.12.2...0.12.4)

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

Author: dependabot-preview[bot]

composer.json

@@ -22,7 +22,7 @@
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "0.12.38",
         "phpstan/phpstan-phpunit": "0.12.10",
-        "phpstan/phpstan-strict-rules": "0.12.2",
+        "phpstan/phpstan-strict-rules": "0.12.4",
         "phpunit/phpunit": "^9.0",
         "simpod/php-coveralls-mirror": "^3.0",
         "thecodingmachine/phpstan-safe-rule": "^1.0"