Users/cleemullins/remove python39 support

[cleemullins]

Fixes #169

Python 3.9 is no longer supported as of Oct 2025. See the versioning page here.

Support for newer python versions will be done in a separate PR (tracked in #170)

[Copilot]

Pull Request Overview

This PR removes support for Python 3.9 across the codebase, updating the minimum required version to Python 3.10 in accordance with Python 3.9's end-of-life status as of October 2025.

• Updated minimum Python version requirement from 3.9 to 3.10 in all package configurations
• Removed Python 3.9 from CI/CD pipeline test matrices
• Updated documentation to reflect the new minimum version requirement

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
versioning/pyproject.toml	Updated minimum Python requirement to 3.10
test_samples/README.md	Updated virtual environment guide to reflect 3.10+ requirement
scripts/README.md	Updated development setup documentation for 3.10+ requirement
libraries/*/pyproject.toml	Updated Python version requirements across all library packages
libraries/*/readme.md	Updated requirements sections in library documentation
README.md	Updated main project documentation and added missing period
.github/workflows/python-package.yml	Removed Python 3.9 from GitHub Actions test matrix
.azdo/ci-pr.yaml	Removed Python 3.9 from Azure DevOps test matrix

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