Bump Microsoft.VisualStudio.Azure.Containers.Tools.Targets in /src

Bumps Microsoft.VisualStudio.Azure.Containers.Tools.Targets from 1.20.1 to 1.21.0.

---
updated-dependencies:
- dependency-name: Microsoft.VisualStudio.Azure.Containers.Tools.Targets
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/IoTHub.Portal.Server/IoTHub.Portal.Server.csproj

@@ -63,7 +63,7 @@
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="8.0.6" />
     <PackageReference Include="Microsoft.Graph" Version="5.56.0" />
     <PackageReference Include="Microsoft.OpenApi" Version="1.6.15" />
-    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.20.1" />
+    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" />
     <PackageReference Include="Microsoft.Identity.Web.UI" Version="2.19.1" />
     <PackageReference Include="MudBlazor" Version="6.20.0" />
     <PackageReference Include="NetEscapades.AspNetCore.SecurityHeaders" Version="0.22.0" />