Update orchestra/database requirement from ^3.8 to ^4.3

Updates the requirements on [orchestra/database](https://github.com/orchestral/database) to permit the latest version.
- [Release notes](https://github.com/orchestral/database/releases)
- [Commits](orchestral/database@v3.8.0...v4.3.0)

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

composer.json

@@ -19,7 +19,7 @@
         "laravel/framework": "~5.5||~6.0||~7.0"
     },
     "require-dev": {
-        "orchestra/database": "^3.8",
+        "orchestra/database": "^4.3",
         "orchestra/testbench": "~3.8"
     },
     "autoload": {