chore(deps/composer): bump phpunit/phpunit from 9.6.15 to 9.6.19

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.15 to 9.6.19.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.19/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.6.15...9.6.19)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

composer.json

@@ -37,7 +37,7 @@
 		"ockcyp/covers-validator": "1.6.0",
 		"php-parallel-lint/php-console-highlighter": "1.0.0",
 		"php-parallel-lint/php-parallel-lint": "1.4.0",
-		"phpunit/phpunit": "9.6.15"
+		"phpunit/phpunit": "9.6.19"
 	},
 	"scripts": {
 		"lint": "parallel-lint . --exclude vendor --exclude node_modules",