deps(deps): bump azure-search-documents from 11.6.0b6 to 11.6.0b8 (#57)

Bumps [azure-search-documents](https://github.com/Azure/azure-sdk-for-python) from 11.6.0b6 to 11.6.0b8.
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/search/azure-search-documents/CHANGELOG.md)
- [Commits](Azure/azure-sdk-for-python@azure-search-documents_11.6.0b6...azure-search-documents_11.6.0b8)

---
updated-dependencies:
- dependency-name: azure-search-documents
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

deploy_ai_search/requirements.txt

@@ -1,5 +1,5 @@
 python-dotenv
-azure-search-documents==11.6.0b6
+azure-search-documents==11.6.0b8
 azure-storage-blob
 azure-identity
 azure-mgmt-web