src/Model/Container.php:14:37: MissingTemplateParam: Geissler\Converter\Model\Container has missing template params when extending IteratorAggregate, expecting 2 (see https://psalm.dev/182)

src/Model/Container.php:14:57: MissingTemplateParam: Geissler\Converter\Model\Container has missing template params when extending ArrayAccess, expecting 2 (see https://psalm.dev/182)

Process completed with exit code 2.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/cache@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/