PHPStan: Accept mixed in array

The immediate call to `Utils\assoc_args_to_str()` handles `bool`, `array`, and anything `escapeshellarg()` can handle.

Author: BrianHenryIE

src/Context/FeatureContext.php

@@ -1247,7 +1247,7 @@ public function drop_db(): void {
 
 	/**
 	 * @param string $command
-	 * @param array<string, string> $assoc_args
+	 * @param array<string, mixed> $assoc_args
 	 * @param string $path
 	 * @return Process
 	 */