refactor: drop support for Python 3.10

[gforsyth]

Description

Contributes to rapidsai/build-planning#246

Finishes the work of dropping Python 3.10 support.

This project stopped building / testing against Python 3.10 as of rapidsai/shared-workflows#494
This PR updates configuration and docs to reflect that.

Followups before merging

Check that there are no remaining uses like this:

git grep -E '3\.10'
git grep '310'
git grep 'py310'

Summary by CodeRabbit

• Chores
  • Updated minimum Python version requirement from 3.10 to 3.11 across all configuration files, documentation, and environment specifications.

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[gforsyth]

/ok to test

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request systematically raises the minimum Python version requirement from 3.10 to 3.11 across the entire project, including CI workflows, documentation, conda environments, and project metadata files.

Changes

Cohort / File(s)	Summary
CI Configuration .github/workflows/pr.yaml	Updated lean CI matrix filter to use Python 3.11 instead of 3.10 for AMD64/CUDA combinations.
Documentation CONTRIBUTING.md, README.md, docs/cuopt/source/system-requirements.rst	Updated Python minimum version references from 3.10 to 3.11 across contributor guide, installation instructions, and system requirements documentation.
Conda Environments conda/environments/all_cuda-129_arch-*.yaml, conda/environments/all_cuda-131_arch-*.yaml	Updated Python dependency constraints from >=3.10,<3.14 to >=3.11,<3.14 across all conda environment specifications.
Project Metadata and Dependencies dependencies.yaml, python/cuopt/cuopt/linear_programming/pyproject.toml, python/cuopt/pyproject.toml, python/cuopt_self_hosted/pyproject.toml, python/cuopt_server/pyproject.toml, python/libcuopt/pyproject.toml	Updated requires-python from >=3.10 to >=3.11 and removed Python 3.10 classifier entries across project configurations. Removed Python 3.10 from dependency matrix in dependencies.yaml.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'refactor: drop support for Python 3.10' directly and clearly summarizes the main change across all modified files, which consistently update Python version requirements from 3.10 to 3.11.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@docs/cuopt/source/system-requirements.rst`:
- Around line 28-30: Add an explicit deprecation note immediately under the
Python version line ">= 3.11.* and <= 3.13.*" stating that support for Python
3.10 has been removed, summarizing the impact and linking to migration guidance;
include a short bullet list of migration steps (upgrade Python interpreter, test
dependencies, update virtualenv/pyenv settings) and a pointer to relevant docs
or migration guide, and mirror this same deprecation/migration note at the other
occurrence of the version line (the second Python version block referenced in
the review).

In `@python/libcuopt/pyproject.toml`:
- Line 20: The pyproject.toml requires-python constraint currently only sets a
minimum (requires-python = ">=3.11") but the docs state support is capped at
Python 3.13; update the requires-python entry in pyproject.toml to include an
upper bound (e.g., requires-python = ">=3.11, <3.14") so pip will not attempt
installs on unsupported Python 3.14+ versions.

[gforsyth]

/merge