Bump Microsoft.Azure.Cosmos from 3.42.0 to 3.43.0 in /webapi

Bumps [Microsoft.Azure.Cosmos](https://github.com/Azure/azure-cosmos-dotnet-v3) from 3.42.0 to 3.43.0.
- [Release notes](https://github.com/Azure/azure-cosmos-dotnet-v3/releases)
- [Changelog](https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/changelog.md)
- [Commits](Azure/azure-cosmos-dotnet-v3@3.42.0...3.43.0)

---
updated-dependencies:
- dependency-name: Microsoft.Azure.Cosmos
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

webapi/CopilotChatWebApi.csproj

@@ -20,7 +20,7 @@
   <ItemGroup>
     <PackageReference Include="Azure.Extensions.AspNetCore.Configuration.Secrets" Version="1.3.2" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.22.0" />
-    <PackageReference Include="Microsoft.Azure.Cosmos" Version="3.42.0" />
+    <PackageReference Include="Microsoft.Azure.Cosmos" Version="3.43.0" />
     <PackageReference Include="Microsoft.Identity.Web" Version="2.20.0" />
     <PackageReference Include="Microsoft.KernelMemory.Abstractions" Version="0.66.240709.1" />
     <PackageReference Include="Microsoft.SemanticKernel" Version="1.15.1" />