Update ContainerOp in pipeline 07_container_components_pipeline

[strangiato]

There is no longer a containerop in v2.

07_container_components_pipeline.py executes with the following error:

AttributeError: module 'kfp.dsl' has no attribute 'ContainerOp'. Did you mean: 'ContainerSpec'?

Full stack trace:

$ python pipelines/07_container_components_pipeline.py 
Traceback (most recent call last):
  File "/Users/my-user/code/rhai/kubeflow-pipelines-examples/pipelines/07_container_components_pipeline.py", line 20, in <module>
    @kfp.dsl.pipeline(
     ^^^^^^^^^^^^^^^^^
  File "/Users/my-user/code/rhai/kubeflow-pipelines-examples/.venv/lib/python3.11/site-packages/kfp/dsl/pipeline_context.py", line 65, in pipeline
    return component_factory.create_graph_component_from_func(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/my-user/code/rhai/kubeflow-pipelines-examples/.venv/lib/python3.11/site-packages/kfp/dsl/component_factory.py", line 673, in create_graph_component_from_func
    return graph_component.GraphComponent(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/my-user/code/rhai/kubeflow-pipelines-examples/.venv/lib/python3.11/site-packages/kfp/dsl/graph_component.py", line 58, in __init__
    pipeline_outputs = pipeline_func(*args_list)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/my-user/code/rhai/kubeflow-pipelines-examples/pipelines/07_container_components_pipeline.py", line 29, in add_pipeline
    add_op = kfp.dsl.ContainerOp(  # noqa: F841
             ^^^^^^^^^^^^^^^^^^^
AttributeError: module 'kfp.dsl' has no attribute 'ContainerOp'. Did you mean: 'ContainerSpec'?```