fix(helpers): prevent warnings when loading database helpers

tests/Unit/HelperSyntaxTest.php

@@ -0,0 +1,20 @@
+<?php
+
+use Symfony\Component\Process\Process;
+
+it('loads the database helper without PHP warnings', function () {
+    $process = new Process([
+        PHP_BINARY,
+        '-d',
+        'display_errors=1',
+        '-d',
+        'error_reporting=E_ALL',
+        '-l',
+        __DIR__.'/../../bootstrap/helpers/databases.php',
+    ]);
+
+    $process->run();
+
+    expect($process->isSuccessful())->toBeTrue()
+        ->and($process->getOutput().$process->getErrorOutput())->not->toContain('Warning');
+});