Update symfony/process requirement from ^4.0 to ^5.2

Updates the requirements on [symfony/process](https://github.com/symfony/process) to permit the latest version.
- [Release notes](https://github.com/symfony/process/releases)
- [Changelog](https://github.com/symfony/process/blob/5.x/CHANGELOG.md)
- [Commits](symfony/process@v4.0.0...v5.2.1)

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

Author: dependabot[bot]

Diff for: composer.json

@@ -12,7 +12,7 @@
 		"phpstan/phpstan": "^0.12.60",
 		"phpstan/phpstan-strict-rules": "^0.12.5",
 		"phpunit/phpunit": "^7.5.20",
-		"symfony/process": "^4.0"
+		"symfony/process": "^5.2"
 	},
 	"config": {
 		"platform": {