update code owners for cosmos api.md file (#31810)

### Packages impacted by this PR


### Issues associated with this PR
This PR updates code owners for cosmos.api.md file.


### Describe the problem that is addressed by this PR


### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_


### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [ ] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [ ] Added a changelog (if necessary)

---------

Co-authored-by: Manik Khandelwal <mkhandelwal@microsoft.com>

.github/CODEOWNERS

@@ -310,6 +310,9 @@ sdk/ai/ai-inference-rest @glharper @dargilco @jhakulin
 # Managment API review files
 /sdk/**/review/arm-*.api.md @qiaozha @MaryGao @Azure/azure-sdk-for-js-core
 
+# Cosmos API review files
+/sdk/cosmosdb/cosmos/review/*api.md @amanrao23 @aditishree1 @sajeetharan @topshot99
+
 # Management Plane
 # PRLabel: %Mgmt
 /sdk/advisor/arm-advisor/ @qiaozha @MaryGao