build: bump azure-search-documents

Bumps the backend-deps group in /infra/scripts/index_scripts with 1 update: [azure-search-documents](https://github.com/Azure/azure-sdk-for-python).


Updates `azure-search-documents` from 11.7.0b1 to 11.7.0b2
- [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_11.7.0b1...azure-search-documents_11.7.0b2)

---
updated-dependencies:
- dependency-name: azure-search-documents
  dependency-version: 11.7.0b2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: backend-deps
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

infra/scripts/index_scripts/requirements.txt

@@ -7,7 +7,7 @@ pypdf
 msal[broker]==1.34.0
 azure-identity
 azure-ai-textanalytics
-azure-search-documents==11.7.0b1
+azure-search-documents==11.7.0b2
 azure-keyvault-secrets
 pandas
 datetime