Update to 26.08

[jolorunyomi]

This PR updates the repository to version 26.08.

This is part of the 26.06 release burndown process.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Bumped project version from 26.06.00 to 26.08.00
  • Updated all related dependencies to align with the new release version
  • Refreshed CI/CD workflows and build infrastructure to use latest shared workflow versions

Walkthrough

This PR updates the nvforest project to version 26.08.00, migrates all GitHub Actions reusable workflows to the latest @main references (from @cuda-13.2.0), and coordinates RAPIDS dependency pins across conda environments and Python packages from 26.6.* to 26.8.*.

Changes

Version and CI Workflow Coordination

Layer / File(s)	Summary
Version declaration and CI workflow infrastructure VERSION, .github/workflows/build.yaml, .github/workflows/pr.yaml, .github/workflows/test.yaml	VERSION updated to 26.08.00; all reusable-workflow uses: references in GitHub Actions workflows (cpp-build, python-build, docs-build, upload-conda, wheel-build/publish for libnvforest and nvforest, pr-builder, changed-files, checks, conda-cpp/python jobs, devcontainer, and wheel tests) switch from @cuda-13.2.0 to @main; docs-build container image updated from rapidsai/ci-conda:26.06-latest to rapidsai/ci-conda:26.08-latest.
Conda environment dependency pins conda/environments/all_cuda-129_arch-aarch64.yaml, conda/environments/all_cuda-129_arch-x86_64.yaml, conda/environments/all_cuda-132_arch-aarch64.yaml, conda/environments/all_cuda-132_arch-x86_64.yaml, conda/environments/clang_tidy_cuda-129_arch-x86_64.yaml, conda/environments/clang_tidy_cuda-132_arch-x86_64.yaml, conda/environments/cpp_all_cuda-129_arch-x86_64.yaml, conda/environments/cpp_all_cuda-132_arch-x86_64.yaml	RAPIDS component version pins bumped from 26.6.* to 26.8.* across all conda environments: libraft, libraft-headers, librmm, pylibraft, rapids-xgboost, and libnvforest-tests for both CUDA 12.9 and 13.2, and both aarch64 and x86_64 architectures.
Central dependency manifest and Python package pins dependencies.yaml, python/libnvforest/pyproject.toml, python/nvforest/pyproject.toml	dependencies.yaml updated with 26.8.* pins for libnvforest-tests, rapids-xgboost, nvforest, libraft (unsuffixed and CUDA-suffixed cu12/cu13), libraft-headers, librmm (unsuffixed and CUDA-suffixed cu12/cu13), and pylibraft (unsuffixed and CUDA-suffixed cu12/cu13); pyproject.toml files updated in both packages to pin libraft, librmm, libnvforest, and pylibraft to 26.8.* in both [project].dependencies and [tool.rapids-build-backend] sections.

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• rapidsai/nvforest#83: Both PRs update the same CI workflow wiring and bump the same dependency/version pins across workflows, environments, and Python packages to a newer 26.x release.
• rapidsai/nvforest#110: Both PRs directly edit the same GitHub Actions reusable-workflow uses: references, switching between rapidsai/shared-workflows/...@cuda-13.2.0 and ...@main in .github/workflows/build.yaml, pr.yaml, and test.yaml.
• rapidsai/nvforest#89: Both PRs modify GitHub Actions workflow wiring for the devcontainer and update docs/container image tags.

Suggested labels

conda, Cython / Python, ci, improvement, non-breaking

Suggested reviewers

• msarahan
• gforsyth
• bdice

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Update to 26.08' clearly and concisely summarizes the main change across the entire changeset: updating the project version from 26.06 to 26.08.
Description check	✅ Passed	The description directly relates to the changeset by explaining that the PR updates the repository to version 26.08 as part of the release process.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch version-update-26.08

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