Upgrade Python runtime from 3.12 to 3.13 (current GA)

[paulyuk]

Summary

Upgrade the Python runtime from 3.12 to 3.13, which is the latest GA version supported by Azure Functions.

Current State

infra/main.bicep:

runtimeName: 'python'
runtimeVersion: '3.12'

Proposed Changes

infra/main.bicep:

runtimeName: 'python'
runtimeVersion: '3.13'  // Latest GA

requirements.txt: (if any version pins need updating)

• Review and update any packages that have Python 3.13 compatibility improvements

Why This Change?

Python 3.13 is now the latest GA version supported by Azure Functions Flex Consumption plan. Key improvements include:

• Performance optimizations
• Improved error messages
• New typing features
• Better async support

Supported Python Versions (Feb 2026)

Version	Status
3.13	✅ GA (recommended)
3.12	✅ GA
3.11	✅ GA
3.10	✅ GA

Testing Checklist

• pip install -r requirements.txt succeeds
• func start runs without errors
• azd up deploys successfully
• HTTP functions respond correctly
• No deprecation warnings in logs

Reference

• Azure Functions Python Support