Fix agent tool response handling and update requirements for swarm agent

[Khalizo]

Changes

Agent-as-Tool Tutorial:

• Fixed response attribute access in agent-as-tools.ipynb to use dictionary notation (message['content']) instead of dot
  notation (message.content)
• Ensures compatibility with current Strands Agents API response structure

Swarm Agent Requirements:

• Added minimum version constraint for strands-agents[a2a]>=1.17.0

Testing

• Verified agent-as-tool notebook runs without attribute errors
• Confirmed swarm agent example works with updated dependencies

[github-actions]

Latest scan for commit: b40e145 | Updated: 2025-12-04 20:38:15 UTC

✅ Security Scan Report (PR Files Only)

Scanned Files

• 01-tutorials/02-multi-agent-systems/01-agent-as-tool/agent-as-tools.ipynb
• 01-tutorials/02-multi-agent-systems/02-swarm-agent/requirements.txt

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Security Scan Results

Critical	High	Medium	Low	Info
0	0	0	0	0

Threshold: High

No security issues detected in your changes. Great job!

This scan only covers files changed in this PR.