Fix ModuleNotFoundError: No module named 'httpx' in labs 02 and 05

[ivorb]

Fixes #147

Root cause

azure-ai-projects==2.0.0b4 does import httpx at the top of azure/ai/projects/_patch.py (and uses httpx.Client / httpx.HTTPTransport when building the OpenAI client), but it does not declare httpx as a dependency — it relied on openai pulling it in transitively.

azure-ai-projects==2.0.0b4 requires openai>=2.8.0 with no upper bound, and openai 3.x replaced its httpx dependency with httpx2. So a fresh pip install -r requirements.txt now resolves openai 3.x, httpx is never installed, and azure.ai.projects fails with ModuleNotFoundError: No module named 'httpx'.

Change

Added openai<3 and httpx to the two Python labs that install and import azure-ai-projects==2.0.0b4:

• Labfiles/02-language-agent/Python/text-agent/requirements.txt
• Labfiles/05-speech-tool/Python/speech-client/requirements.txt (same latent failure, not yet reported)

The openai<3 pin goes slightly beyond the issue's suggestion of adding only httpx, because the SDK passes an httpx.Client into the OpenAI(...) constructor and reads client.user_agent. openai 3.x is built on httpx2, so adding httpx alone would leave the labs on an untested major version with a mismatched HTTP client type.

Labfiles/06-voice-live installs azure-ai-projects==2.0.0b4 in its exercise instructions but never imports it, so it is unaffected and left unchanged. No exercise markdown changes are needed — both exercises simply run pip install -r requirements.txt.

Verification

Clean venv install of the updated lab 02 requirements:

Successfully installed ... azure-ai-projects-2.0.0b4 ... httpx-0.28.1 ... openai-2.54.0 ...

> python -c "from azure.ai.projects import AIProjectClient; import httpx, openai; print('OK', httpx.__version__, openai.__version__)"
OK 0.28.1 2.54.0