feat: drop Python 3.9 support and add Python 3.14 support

[Copilot]

Aligns this SDK with kiota-python by removing Python 3.9 from all supported version references and adding Python 3.14. Minimum supported version is now 3.10.

Overview

• pyproject.toml: requires-python bumped to >=3.10; removed Programming Language :: Python :: 3.9 classifier and added Programming Language :: Python :: 3.14 classifier
• .github/workflows/build.yml: removed "3.9" from the CI test matrix and added "3.14"
• README.md: prerequisites updated from Python 3.9+ → Python 3.10+
• .devcontainer/devcontainer.json: removed the 3.9-bookworm commented image reference; updated the active image to mcr.microsoft.com/devcontainers/python:3.14-bookworm

Notes

No dependency version changes were required at this time — no dependencies were being held back solely for 3.9 compatibility.

Testing Instructions

• Check out this branch
• Confirm pyproject.toml no longer lists 3.9 in classifiers or requires-python
• Confirm the build.yml matrix runs ["3.10", "3.11", "3.12", "3.13", "3.14"]
• Confirm .devcontainer/devcontainer.json no longer references 3.9 and the active image is 3.14-bookworm
• Optionally attempt pip install in a Python 3.9 environment — expect a resolver error indicating the package requires >=3.10

[Ramses Sanchez-Hernandez (ramsessanchez)]

Copilot add support for 3.14

[Copilot]

Copilot add support for 3.14

Done in e2bfae1 — added "3.14" to the CI matrix in build.yml and the Programming Language :: Python :: 3.14 classifier in pyproject.toml.

[Ramses Sanchez-Hernandez (ramsessanchez)]

Copilot remove 3.9 from .devcontainer, also make sure target image is 3.14

[Copilot]

Copilot remove 3.9 from .devcontainer, also make sure target image is 3.14

Done in 55b1f0c — removed the 3.9-bookworm commented image line from .devcontainer/devcontainer.json and updated the active image to mcr.microsoft.com/devcontainers/python:3.14-bookworm.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud