Consolidate third-party `dependencies.yaml` into top-level `dependencies.yaml`

Currently cuDF has a separate `dependencies.yaml` for third-party integration testing

https://github.com/rapidsai/cudf/blob/29fcf27d02ec3538d15e1a079ad4072e28289e81/python/cudf/cudf_pandas_tests/third_party_integration_tests/dependencies.yaml#L1

While this is was likely reasonable when setting this up at the time, we have noticed automated build logic updates frequently miss this nested file. Sometimes it is still missed during review

To simplify the update process and allow automated build updates to rollout smoothly in cuDF, this content would best be consolidated in the top-level `dependencies.yaml`

https://github.com/rapidsai/cudf/blob/bd340629a73ac87b8153e2b0e49cf91c16a6b13d/dependencies.yaml#L1

This way all the logic lives in the one `dependencies.yaml` file that is seeing regular updates with automated build updates