Build(deps): bump phpstan/phpstan-phpunit in /.dev-tools

Bumps [phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit) from 1.2.2 to 1.3.3.
- [Release notes](https://github.com/phpstan/phpstan-phpunit/releases)
- [Commits](phpstan/phpstan-phpunit@1.2.2...1.3.3)

---
updated-dependencies:
- dependency-name: phpstan/phpstan-phpunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.dev-tools/composer.json

@@ -10,7 +10,7 @@
         "phpmd/phpmd": "^2.13",
         "phpstan/extension-installer": "^1.2",
         "phpstan/phpstan": "^1.9.2",
-        "phpstan/phpstan-phpunit": "^1.2.2",
+        "phpstan/phpstan-phpunit": "^1.3.3",
         "phpstan/phpstan-strict-rules": "^1.4.4",
         "squizlabs/php_codesniffer": "^3.7.1",
         "vimeo/psalm": "^5.0"