chore: Bump the microsoft-packages group with 1 update (#145)

Bumps Microsoft.NET.Test.Sdk from 18.0.1 to 18.3.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft-packages
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

OpenReferralApi.Tests/OpenReferralApi.Tests.csproj

@@ -11,7 +11,7 @@
 
     <ItemGroup>
         <PackageReference Include="coverlet.collector" Version="8.0.0" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
         <PackageReference Include="Moq" Version="4.20.72" />
         <PackageReference Include="NUnit" Version="4.4.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.11.2" />