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/sebastian/code-unit/src/CodeUnitCollectionIterator.php

@@ -1,54 +0,0 @@
-<?php declare(strict_types=1);
-/*
- * This file is part of sebastian/code-unit.
- *
- * (c) Sebastian Bergmann <sebastian@phpunit.de>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-namespace SebastianBergmann\CodeUnit;
-
-use Iterator;
-
-/**
- * @template-implements Iterator<int, CodeUnit>
- */
-final class CodeUnitCollectionIterator implements Iterator
-{
-    /**
-     * @psalm-var list<CodeUnit>
-     */
-    private array $codeUnits;
-    private int $position = 0;
-
-    public function __construct(CodeUnitCollection $collection)
-    {
-        $this->codeUnits = $collection->asArray();
-    }
-
-    public function rewind(): void
-    {
-        $this->position = 0;
-    }
-
-    public function valid(): bool
-    {
-        return isset($this->codeUnits[$this->position]);
-    }
-
-    public function key(): int
-    {
-        return $this->position;
-    }
-
-    public function current(): CodeUnit
-    {
-        return $this->codeUnits[$this->position];
-    }
-
-    public function next(): void
-    {
-        $this->position++;
-    }
-}