* Fix broken docker test
Fixes#4336
Update the Docker test workflow to use the `get_version` function from `langflow.utils.version`.
* Modify the `Test image` step in `.github/workflows/docker_test.yml` to use the `get_version` function instead of directly importing `__version__`.
* Modify the `Test backend image` step in `.github/workflows/docker_test.yml` to use the `get_version` function instead of directly importing `__version__`.
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* version.version not util.version