[submodule-sync] bot-submodule-sync-main to main [skip ci] [bot]

[nvauto]

submodule-sync to create a PR keeping thirdparty/cudf up-to-date.
HEAD commit SHA: 689d8e6, cudf commit SHA: rapidsai/cudf@9f78795

This PR will be auto-merged if test passed. If failed, it will remain open until test pass or manually fix.

[nvauto]

HEAD commit SHA: 689d8e6, CUDF commit SHA: rapidsai/cudf@9f78795
Test passed: True

[nvauto]

SUCCESS - auto-merge

[greptile-apps]

Greptile Summary

Advances the vendored cuDF dependency to commit 9f78795bca39f579acb660b87b1a765e569dd768.

• Updates only the thirdparty/cudf submodule pointer.
• Makes no direct changes to this repository's source code, build configuration, dependency pins, or patches.

Confidence Score: 5/5

The PR appears safe to merge based on the available changed code.

The visible change only advances the cuDF submodule pointer, with no concrete build, API, patch, or runtime failure established.

Important Files Changed

Filename	Overview
thirdparty/cudf	Updates the cuDF submodule from 7f58752a1b017e703dc16f564c47c71e9697e028 to 9f78795bca39f579acb660b87b1a765e569dd768; no concrete incompatibility is established by the available changes.

_{Reviews (1): Last reviewed commit: "Update submodule cudf to 9f78795bca39f57..." | Re-trigger Greptile}