build: bump the backend-deps group

Bumps the backend-deps group in /infra/scripts/index_scripts with 2 updates: [msal[broker]](https://github.com/AzureAD/microsoft-authentication-library-for-python) and [azure-search-documents](https://github.com/Azure/azure-sdk-for-python).


Updates `msal[broker]` from 1.33.0 to 1.34.0
- [Release notes](https://github.com/AzureAD/microsoft-authentication-library-for-python/releases)
- [Changelog](https://github.com/AzureAD/microsoft-authentication-library-for-python/blob/dev/RELEASES.md)
- [Commits](AzureAD/microsoft-authentication-library-for-python@1.33.0...1.34.0)

Updates `azure-search-documents` from 11.6.0b12 to 11.7.0b1
- [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_11.6.0b12...azure-search-documents_11.7.0b1)

---
updated-dependencies:
- dependency-name: msal[broker]
  dependency-version: 1.34.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend-deps
- dependency-name: azure-search-documents
  dependency-version: 11.7.0b1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend-deps
...

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

Author: dependabot[bot]

infra/scripts/index_scripts/requirements.txt

@@ -4,10 +4,10 @@ openai
 pypdf
 # pyodbc
 # tiktoken
-msal[broker]==1.33.0
+msal[broker]==1.34.0
 azure-identity
 azure-ai-textanalytics
-azure-search-documents==11.6.0b12
+azure-search-documents==11.7.0b1
 azure-keyvault-secrets
 pandas
 datetime