Update supported Python versions (Python 3.9 EOL 10/2025)

[asonnenschein]

This PR updates the SDK's supported Python versions to 3.10, 3.11, 3.12, 3.13, 3.14, and 3.15, and bumps the lowest supported Python version (defined in pyproject.toml via variable requires-python) to 3.10.

Python version 3.9 will reach EOL next month, in October 2025. See https://devguide.python.org/versions/ for more details about Python version lifecycles.

#1195

[Copilot]

Pull Request Overview

This PR updates the minimum supported Python version from 3.9 to 3.10 and adds support for Python 3.14 and 3.15, in preparation for Python 3.9's end-of-life in October 2025.

• Updates minimum Python version requirement from 3.9 to 3.10 in project configuration
• Adds Python 3.14 and 3.15 to the supported versions list across testing infrastructure
• Updates documentation to reflect the new minimum Python version requirement

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updates minimum Python version requirement to 3.10
noxfile.py	Updates test session Python versions to include 3.14, 3.15 and removes 3.9
docs/get-started/quick-start-guide.md	Updates documentation to reflect Python 3.10 minimum requirement
.github/workflows/test.yml	Updates CI matrix to test against Python 3.10-3.15 instead of 3.9-3.13

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