Incorrect environment variable for ElevenLabs API key in blog_to_podcast_agent.py

[haoduotnt]

File:
starter_ai_agents/ai_blog_to_podcast_agent/audio_generations/blog_to_podcast_agent.py

Issue:
The code uses the environment variable ELEVENLABS_API_KEY, which is incorrect and causes authentication failure when calling the ElevenLabs API.

Line in question:

os.environ["ELEVENLABS_API_KEY"]

Fix:
It should be:

os.environ["ELEVEN_LABS_API_KEY"]

Impact:
Using the incorrect environment variable name results in a 401 Unauthorized error when making requests to the ElevenLabs API.

Reference:
Elevenlabs API - Error: 401 Client Error: Unauthorized for url

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[Shubhamsaboo]

Its fixed here: #230