Bump Microsoft.AspNetCore.Mvc.Testing and Microsoft.NET.Test.Sdk

Bumps Microsoft.AspNetCore.Mvc.Testing from 8.0.10 to 8.0.21
Bumps Microsoft.NET.Test.Sdk from 17.14.1 to 18.0.0

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Mvc.Testing
  dependency-version: 8.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: microsoft
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: microsoft
...

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

Author: dependabot[bot]

tests/BHS.Api.IntegrationTests/BHS.Api.IntegrationTests.csproj

@@ -18,8 +18,8 @@
     <PackageReference Include="EphemeralMongo4.runtime.linux-x64" Version="1.1.3" Condition="$([MSBuild]::IsOSPlatform('Linux'))" />
     <PackageReference Include="EphemeralMongo4.runtime.osx-x64" Version="1.1.3" Condition="$([MSBuild]::IsOSPlatform('OSX'))" />
     <PackageReference Include="EphemeralMongo4.runtime.win-x64" Version="1.1.3" Condition="$([MSBuild]::IsOSPlatform('Windows'))" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.10" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.21" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="xunit.v3" Version="3.0.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.3">