fix: broken docker test (langflow-ai#4337)

* Fix broken docker test

Fixes langflow-ai#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__`.

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/langflow-ai/langflow/issues/4336?shareId=XXXX-XXXX-XXXX-XXXX).

* version.version not util.version

.github/workflows/docker_test.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Test image
         run: |
           expected_version=$(cat pyproject.toml | grep version | head -n 1 | cut -d '"' -f 2)
-          version=$(docker run --rm --entrypoint bash langflowai/langflow:latest-dev -c 'python -c "from langflow.version import __version__ as langflow_version; print(langflow_version)"')
+          version=$(docker run --rm --entrypoint bash langflowai/langflow:latest-dev -c 'python -c "from langflow.version.version import get_version; print(get_version())"')
           if [ "$expected_version" != "$version" ]; then
               echo "Expected version: $expected_version"
               echo "Actual version: $version"
@@ -51,7 +51,7 @@ jobs:
       - name: Test backend image
         run: |
           expected_version=$(cat pyproject.toml | grep version | head -n 1 | cut -d '"' -f 2)
-          version=$(docker run --rm --entrypoint bash langflowai/langflow-backend:latest-dev -c 'python -c "from langflow.version import __version__ as langflow_version; print(langflow_version)"')
+          version=$(docker run --rm --entrypoint bash langflowai/langflow-backend:latest-dev -c 'python -c "from langflow.version.version import get_version; print(get_version())"')
           if [ "$expected_version" != "$version" ]; then
               echo "Expected version: $expected_version"
               echo "Actual version: $version"