[5.6] Passes token configuration value to AWS Client

[shrink]

The AWS client accepts a token configuration value alongside key and secret. This value is optional in most cases but it is required when accessing AWS in some environments, e.g: Lambda. At present the Laravel S3 storage driver and the Laravel SQS connector cannot be used from within a Lambda function because this value is not passed through.

Via AwsClient:

     * - credentials:
     *   (Aws\Credentials\CredentialsInterface|array|bool|callable) Specifies
     *   the credentials used to sign requests. Provide an
     *   Aws\Credentials\CredentialsInterface object, an associative array of
     *   "key", "secret", and an optional "token" key, `false` to use null
     *   credentials, or a callable credentials provider used to create
     *   credentials or return null. See Aws\Credentials\CredentialProvider for
     *   a list of built-in credentials providers. If no credentials are
     *   provided, the SDK will attempt to load them from the environment.

This was already fixed for the for the mail manager in #23766

This PR fixes it for the S3 driver and the SQS connector which are the remaining AWS integrations in laravel/framework.