Update to 26.10

[jolorunyomi]

This PR updates the repository to version 26.10.

This is part of the 26.08 release burndown process.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 7f774b2f-8b62-472f-8fa0-7f14cccad860

📥 Commits

Reviewing files that changed from the base of the PR and between 06b2665 and 9ae5725.

📒 Files selected for processing (19)

• .devcontainer/cuda12.9-conda/devcontainer.json
• .devcontainer/cuda12.9-pip/devcontainer.json
• .devcontainer/cuda13.3-conda/devcontainer.json
• .devcontainer/cuda13.3-pip/devcontainer.json
• .github/workflows/build.yaml
• .github/workflows/pr.yaml
• CONTRIBUTING.md
• VERSION
• conda/environments/all_cuda-129_arch-aarch64.yaml
• conda/environments/all_cuda-129_arch-x86_64.yaml
• conda/environments/all_cuda-133_arch-aarch64.yaml
• conda/environments/all_cuda-133_arch-x86_64.yaml
• conda/environments/clang_tidy_cuda-129_arch-x86_64.yaml
• conda/environments/clang_tidy_cuda-133_arch-x86_64.yaml
• conda/environments/cpp_all_cuda-129_arch-x86_64.yaml
• conda/environments/cpp_all_cuda-133_arch-x86_64.yaml
• dependencies.yaml
• python/cuml/pyproject.toml
• python/libcuml/pyproject.toml

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📝 Walkthrough

Summary by CodeRabbit

• Release

  • Updated the project to the 26.10 release.

• Dependency Updates

  • Refreshed RAPIDS and CUDA-related packages across supported CUDA 12.9 and 13.3 environments.
  • Updated Python, C++, testing, and distributed-computing dependency versions.

• Development Environments

  • Updated GPU development containers to use the 26.10 toolchain.

• Documentation

  • Updated contributor instructions to reference the latest development image.

• CI

  • Refreshed build, documentation, linting, and notebook test environments to the 26.10 images.

Walkthrough

Changes

RAPIDS 26.10 release refresh

Layer / File(s)	Summary
Release and package manifests VERSION, conda/environments/*, python/*/pyproject.toml	The recorded release version and RAPIDS dependency constraints are updated from 26.08 to 26.10 across CUDA environments and Python packages.
Dependency matrix pins dependencies.yaml	Test, unsuffixed, and CUDA-specific RAPIDS dependency aliases are updated to 26.10.*.
Development and CI runtime images .devcontainer/*, .github/workflows/*, CONTRIBUTING.md	Development containers, CI jobs, and the documented clang-tidy command reference 26.10 images and features.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• rapidsai/cuml#7879: Similar repository-wide RAPIDS version and image tag refresh.
• rapidsai/cuml#8109: Similar dependency, workflow, and devcontainer version bump.
• rapidsai/cuml#8374: Related SPDX header updates affecting Python project metadata.

Suggested labels: CUDA/C++

Suggested reviewers: bdice, jameslamb, divyegala

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change as a repository-wide update to version 26.10.
Description check	✅ Passed	The description matches the diff, stating the repo is being updated to version 26.10 as part of the 26.08 burndown.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch version-update-26.10

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