composer(deps): update statamic/cms requirement from ^5.0 to ^5.19

Updates the requirements on [statamic/cms](https://github.com/statamic/cms) to permit the latest version.
- [Release notes](https://github.com/statamic/cms/releases)
- [Changelog](https://github.com/statamic/cms/blob/5.x/CHANGELOG.md)
- [Commits](statamic/cms@v5.0.0...v5.19.0)

---
updated-dependencies:
- dependency-name: statamic/cms
  dependency-type: direct:production
...

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

composer.json

@@ -22,7 +22,7 @@
     "require": {
         "php": "^8.3",
         "ext-json": "*",
-        "statamic/cms": "^5.0"
+        "statamic/cms": "^5.19"
     },
     "require-dev": {
         "orchestra/testbench": "^9.1",