HYBIM-816 Removing python 3.10 dependencies

[shuningc]

Drop Python 3.10 support (EOL October 2026)

Python 3.10 reaches End of Life on October 31, 2026. This PR removes it from the supported range ahead of that date so we
don't ship a new SDK version that targets a soon-to-be-unsupported runtime.

Changes

PyPI metadata (requires-python / python constraint)

• splunk-ao, galileo-a2a, galileo-adk: bumped from >=3.10 to >=3.11

CI test matrix

• Removed "3.10" from python-version in .github/workflows/ci-tests.yaml; matrix now covers 3.11, 3.12, 3.13, 3.14

Tooling alignment

• ruff target-version: py310 → py311 (all three packages)
• mypy python_version: 3.10 → 3.11 (galileo-a2a, galileo-adk)
• litellm / crewai Poetry dependency lower bound: >=3.10,<3.14 → >=3.11,<3.14

Lock file

• Regenerated poetry.lock; dropped three 3.10-only backports that are built into 3.11's stdlib: async_timeout,
  backports-asyncio-runner, exceptiongroup