Update react/child-process requirement from 0.6.6 to 0.6.7 (#10)

* Update react/child-process requirement from 0.6.6 to 0.6.7

Updates the requirements on [react/child-process](https://github.com/reactphp/child-process) to permit the latest version.
- [Release notes](https://github.com/reactphp/child-process/releases)
- [Changelog](https://github.com/reactphp/child-process/blob/v0.6.7/CHANGELOG.md)
- [Commits](reactphp/child-process@v0.6.6...v0.6.7)

---
updated-dependencies:
- dependency-name: react/child-process
  dependency-version: 0.6.7
  dependency-type: direct:production
...

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

* Update react/child-process version constraint

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Valithor Obsidion <[email protected]>

Author: dependabot[bot]

composer.json

@@ -13,7 +13,7 @@
         "clue/redis-react": "^2.6",
         "react/filesystem": "^0.2@dev",
         "react/async": "4.x-dev",
-        "react/child-process": "0.6.6",
+        "react/child-process": "^0.6.6",
         "vzgcoders/twitchphp": "dev-main",
         "valzargaming/byond": "dev-main",
         "valzargaming/handler": "dev-main",