build(deps-dev): bump symfony/stopwatch from 5.4.19 to 5.4.21

Bumps [symfony/stopwatch](https://github.com/symfony/stopwatch) from 5.4.19 to 5.4.21.
- [Release notes](https://github.com/symfony/stopwatch/releases)
- [Changelog](https://github.com/symfony/stopwatch/blob/6.2/CHANGELOG.md)
- [Commits](https://github.com/symfony/stopwatch/compare/v5.4.19...v5.4.21)

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

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

composer.json

@@ -58,7 +58,7 @@
         ]
     },
     "require-dev": {
-        "symfony/stopwatch": "5.4.19",
+        "symfony/stopwatch": "5.4.21",
         "phpunit/phpunit": "9.6.4",
         "roave/security-advisories": "dev-master"
     }