Increasing throughput for containers in bullk test (Azure#26627)

### Packages impacted by this PR
@azure/cosmos

### Issues associated with this PR
Bulk tests are failing for Routing gateway with Request Rate is too high
error. Increasing throughput of the containers.

### 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)

sdk/cosmosdb/cosmos/test/public/functional/item/bulk.item.spec.ts

@@ -31,7 +31,7 @@ describe("test bulk operations", async function () {
           paths: ["/key"],
           version: undefined,
         },
-        throughput: 400,
+        throughput: 5000,
       });
     });
     after(async () => {