Update phpstan/phpstan requirement from 1.10.66 to 1.10.67 (#537)

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/1.11.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.66...1.10.67)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -55,7 +55,7 @@
         "php-stubs/wp-cli-stubs": "^2.8",
         "phpstan/extension-installer": "^1.3",
         "phpstan/phpdoc-parser": "^1.23.1",
-        "phpstan/phpstan": "1.10.66",
+        "phpstan/phpstan": "1.10.67",
         "phpunit/phpunit": "^9.3.3 || ^10.0.7",
         "predis/predis": "^2.2.0",
         "rector/rector": "^1.0",