fix(composer): update keywords in composer.json

- Added "testing" to the keywords array in `composer.json`.
- Provides better categorization and discoverability for the package.
- Ensures alignment with the package's purpose and functionality.

Author: guanguans

composer.json

@@ -4,6 +4,7 @@
     "license": "MIT",
     "type": "laravel",
     "keywords": [
+        "testing",
         "soar",
         "SQL",
         "sql",