Bump minimum python version to 3.11

[iplay88keys]

Description

Raises the minimum supported Python version from 3.10 to 3.11 across the Python workspace. kagent-adk already calls asyncio.Task.uncancel() (added in Python 3.11) in its A2A agent executor (#2176), so 3.10 was broken in practice; this makes the declared floor match. 3.10 also reaches end of life in October 2026.

• requires-python: >=3.10 → >=3.11 in all 15 workspace pyprojects (root, packages, samples). The existing <3.14 caps on the crewai packages are unchanged.
• ruff/black target-version: py310 → py311 where set.
• CI: python-test matrix drops 3.10 (now 3.11/3.12/3.13); python-lint installs 3.11.
• uv.lock regenerated: removes async-timeout, exceptiongroup, and backports-asyncio-runner (3.10-only stdlib backports) and collapses the numpy 2.2.6/2.3.2 split resolution to 2.3.2 only.
• Removes the now-dead from datetime import UTC try/except 3.10 fallbacks in kagent-langgraph and kagent-openai (ruff UP017 flags them at the py311 target; its autofix mangles the fallback branch, so they are deleted instead). The typing.override fallbacks stay — those need 3.12.
• CLI Python scaffolding template (go/core/cli/internal/mcp/frameworks/python/templates/pyproject.toml.tmpl): ruff/black target-version and mypy python_version bumped py310/3.10 → py312/3.12 to match the template's own requires-python = ">=3.12".

Test plan

• CI python-test matrix (3.11–3.13) runs the full test suite.
• uv lock resolves cleanly (272 packages).

[Copilot]

Pull request overview

Aligns the declared minimum supported Python version with actual runtime requirements by raising the Python workspace floor from 3.10 to 3.11, and updates CI/lint tooling targets accordingly.

Changes:

• Bump requires-python from >=3.10 to >=3.11 across workspace packages and samples (keeping existing <3.14 caps where present).
• Update Ruff/Black target versions from py310 to py311.
• Update CI to drop Python 3.10 from the test matrix and run linting on Python 3.11; regenerate python/uv.lock.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
python/samples/openai/basic_agent/pyproject.toml	Raise sample’s requires-python to >=3.11.
python/samples/langgraph/kebab/pyproject.toml	Raise sample’s requires-python to >=3.11.
python/samples/langgraph/hitl-tools/pyproject.toml	Raise sample’s requires-python to >=3.11.
python/samples/langgraph/currency/pyproject.toml	Raise sample’s requires-python to >=3.11.
python/samples/crewai/research-crew/pyproject.toml	Raise sample’s requires-python to >=3.11, <3.14.
python/samples/crewai/poem_flow/pyproject.toml	Raise sample’s requires-python to >=3.11, <3.14.
python/pyproject.toml	Update Ruff target-version to py311 for the workspace.
python/packages/kagent-skills/pyproject.toml	Bump requires-python and update Black/Ruff target versions to py311.
python/packages/kagent-openai/pyproject.toml	Bump requires-python and update Black/Ruff target versions to py311.
python/packages/kagent-langgraph/pyproject.toml	Bump requires-python and update Black/Ruff target versions to py311.
python/packages/kagent-crewai/pyproject.toml	Bump requires-python to >=3.11, <3.14.
python/packages/kagent-core/pyproject.toml	Bump requires-python to >=3.11.
python/packages/kagent-adk/pyproject.toml	Bump requires-python to >=3.11.
python/packages/agentsts-core/pyproject.toml	Bump requires-python to >=3.11.
python/packages/agentsts-adk/pyproject.toml	Bump requires-python to >=3.11.
.github/workflows/ci.yaml	Drop Python 3.10 from the test matrix; use Python 3.11 for lint job.
python/uv.lock	Regenerate lockfile to reflect the updated Python version floor and resolution.

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[iplay88keys]

@EItanya, python-test (3.10) is marked as required and will need to be removed from the required status checks in the repo's ruleset for main.

[peterj]

removed 3.10 from the status checks