build(deps): update azure-cosmos requirement

Updates the requirements on [azure-cosmos](https://github.com/Azure/azure-sdk-for-python) to permit the latest version.

Updates `azure-cosmos` to 4.9.0
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/main/doc/esrp_release.md)
- [Commits](Azure/azure-sdk-for-python@azure-cosmos_4.7.0...azure-cosmos_4.9.0)

---
updated-dependencies:
- dependency-name: azure-cosmos
  dependency-type: direct:production
  dependency-group: dependencies
...

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

Author: dependabot[bot]

api/requirements.txt

@@ -9,6 +9,6 @@ python-multipart~=0.0.17
 Pillow~=11.0
 pillow-avif-plugin~=1.4
 pytest~=8.3
-azure-cosmos~=4.7
+azure-cosmos~=4.9
 jsonschema~=4.23
 lxml==5.1.0