Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/vendor/league/config/src/ReadOnlyConfiguration.php

@@ -1,40 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-/*
- * This file is part of the league/config package.
- *
- * (c) Colin O'Dell <colinodell@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace League\Config;
-
-/**
- * Provides read-only access to a given Configuration object
- */
-final class ReadOnlyConfiguration implements ConfigurationInterface
-{
-    private Configuration $config;
-
-    public function __construct(Configuration $config)
-    {
-        $this->config = $config;
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    public function get(string $key)
-    {
-        return $this->config->get($key);
-    }
-
-    public function exists(string $key): bool
-    {
-        return $this->config->exists($key);
-    }
-}