CI Use ipython 7.34.0 in "oldest" version CI

[betatim]

Google Colab uses ipython 7.34.0 with Python 3.12 in their latest runtime version. As we want to support colab we should keep testing with this old version of iPython. iPython 7.x itself isn't incompatible with Python 3.11, but conda-forge does not provide packages for iPython 7 and Python 3.11.

The result of this is that we have to do a bit of gymnastics to use iPython 8 for conda based workflows and iPython 7 for pip based workflows.

Let's see what the CI says to this.

Follow up to #7737

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated minimum ipython dependency version constraints to improve compatibility and flexibility with existing environments.

Walkthrough

The PR updates ipython minimum version constraints from >=8.4.0 to >=7.32.0 across multiple configuration files. Additionally, dependencies.yaml is restructured to handle ipython versions separately for conda and pip-based dependency matrices, with conda using ipython=8 and pip using ipython==7.34.0 for the oldest dependency path.

Changes

Cohort / File(s)	Summary
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	Lowered ipython minimum version constraint from >=8.4.0 to >=7.32.0 across all four environment configuration files.
Dependency Matrix Configuration dependencies.yaml	Restructured ipython version handling to split conda and pip dependency paths in the oldest matrix: conda uses ipython=8, pip/pyproject uses ipython==7.34.0. Updated global ipython constraint from >=8.4.0 to >=7.32.0. Added explanatory comments regarding Python 3.11+ compatibility across package managers.
Test Dependencies python/cuml/pyproject.toml	Reduced ipython test dependency constraint from >=8.4.0 to >=7.32.0 in the optional-dependencies test section.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly references the main change: updating to use ipython 7.34.0 in the oldest version CI, which is the core objective of this pull request.
Description check	✅ Passed	The description clearly explains the rationale for the changes: supporting Google Colab's ipython 7.34.0, handling conda-forge constraints, and implementing different versions for conda vs pip workflows.
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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[csadorf]

Let's see what the CI says to this.

Seems to be working!

[betatim]

The "oldest" wheel test job used ipython 7.34.0. Good to go for me

[csadorf]

/merge