build(deps): update claude-agent-sdk requirement

Updates the requirements on [claude-agent-sdk](https://github.com/anthropics/claude-agent-sdk-python) to permit the latest version.
- [Release notes](https://github.com/anthropics/claude-agent-sdk-python/releases)
- [Changelog](https://github.com/anthropics/claude-agent-sdk-python/blob/main/CHANGELOG.md)
- [Commits](anthropics/claude-agent-sdk-python@v0.1.36...v0.1.66)

---
updated-dependencies:
- dependency-name: claude-agent-sdk
  dependency-version: 0.1.66
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

claude-agent-sdk/requirements.txt

@@ -1,7 +1,7 @@
 slack-sdk==3.41.0
 slack-bolt>=1.28.0
 slack-cli-hooks<1.0.0
-claude-agent-sdk>=0.1.36
+claude-agent-sdk>=0.1.66
 aiohttp>=3.13.3
 python-dotenv==1.2.2