Add support for Python 3.14

[gforsyth]

Description

Contributes to rapidsai/build-planning#205

This PR adds support for Python 3.14.

Notes for Reviewers

This is part of ongoing work to add Python 3.14 support across RAPIDS.
It temporarily introduces a build/test matrix including Python 3.14, from rapidsai/shared-workflows#508.

A follow-up PR will revert back to pointing at the main branch of shared-workflows once all
RAPIDS repos have added Python 3.14 support.

This will fail until all dependencies have been updated to Python 3.14

CI here is expected to fail until all of this project's upstream dependencies support Python 3.14.

This can be merged whenever all CI jobs are passing.

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[gforsyth]

/ok to test

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 8225e0aa-07f1-467e-b740-c18b7c18a9df

📥 Commits

Reviewing files that changed from the base of the PR and between 6e23cc9 and 870acb7.

📒 Files selected for processing (9)

• .github/workflows/build.yaml
• .github/workflows/pr.yaml
• .github/workflows/test.yaml
• conda/environments/all_cuda-129_arch-aarch64.yaml
• conda/environments/all_cuda-129_arch-x86_64.yaml
• conda/environments/all_cuda-131_arch-aarch64.yaml
• conda/environments/all_cuda-131_arch-x86_64.yaml
• conda/recipes/nvforest/recipe.yaml
• dependencies.yaml

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated GitHub Actions workflows across build, test, and pull request pipelines to reference python-3.14.
  • Removed upper version bounds in Conda environment files to support Python 3.14 and newer versions.
  • Updated build recipe runtime target to Python 3.14.

Walkthrough

GitHub Actions workflows updated to reference python-3.14 branches instead of main across multiple jobs. Conda environment files widened Python version constraints by removing upper bounds (changing >=3.11,<3.14 to >=3.11). The Conda recipe runtime updated to Python 3.14, and the dependencies configuration added an explicit Python 3.14 matrix.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflows .github/workflows/build.yaml, .github/workflows/pr.yaml, .github/workflows/test.yaml	Updated workflow action references from @main to @python-3.14 across multiple jobs including cpp-build, python-build, upload-conda, wheel-build/publish, tests, and checks.
Conda Environment Files conda/environments/all_cuda-129_arch-aarch64.yaml, conda/environments/all_cuda-129_arch-x86_64.yaml, conda/environments/all_cuda-131_arch-aarch64.yaml, conda/environments/all_cuda-131_arch-x86_64.yaml	Removed upper bound from Python dependency constraint, changing python>=3.11,<3.14 to python>=3.11 to widen supported versions.
Conda Recipe conda/recipes/nvforest/recipe.yaml	Updated py_runtime_latest context value from "3.13" to "3.14".
Dependencies Configuration dependencies.yaml	Added explicit Python 3.14 matrix entry and separate open-ended python>=3.11 matrix block.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add support for Python 3.14' directly describes the main change in the changeset—updating workflows, environment files, and dependencies to support Python 3.14.
Description check	✅ Passed	The description clearly explains the purpose of adding Python 3.14 support, references the related issue, and provides context about the temporary branch reference and expected CI behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[gforsyth]

/merge