Build(deps-dev): Bump symfony/filesystem from 4.4.7 to 4.4.8

Bumps [symfony/filesystem](https://github.com/symfony/filesystem) from 4.4.7 to 4.4.8.
- [Release notes](https://github.com/symfony/filesystem/releases)
- [Changelog](https://github.com/symfony/filesystem/blob/master/CHANGELOG.md)
- [Commits](symfony/filesystem@v4.4.7...v4.4.8)

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

composer.json

@@ -35,7 +35,7 @@
     "phpstan/phpstan-phpunit": "~0.12.8",
     "phpstan/phpstan-strict-rules": "~0.12.2",
     "phpunit/phpunit": "^7.5.20",
-    "symfony/filesystem": "^4.4.7"
+    "symfony/filesystem": "^4.4.8"
   },
   "config": {
     "platform": {