Update symfony/process requirement from ^6.2.10 to ^6.3.4 (#71)

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/6.3/CHANGELOG.md)
- [Commits](symfony/process@v6.2.10...v6.3.4)

---
updated-dependencies:
- dependency-name: symfony/process
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -20,7 +20,7 @@
   ],
   "require": {
     "php":  "~8.1.0 || ~8.2.0",
-    "symfony/process": "^6.2.10",
+    "symfony/process": "^6.3.4",
     "league/flysystem": "^3.17.0"
   },
   "require-dev": {