No .deps.json for net472 Container task

MSBuild only respects a .deps.json in the net8.0 engine, so there's no
need to create it for a net472 task. It includes references that aren't
part of the SDK, like the downlevel `System.Text.Json` that is provided
by MSBuild/Visual Studio, so removing it can avoid false positives from
dependency scanners.

Author: rainersigwald

src/Containers/Microsoft.NET.Build.Containers/Microsoft.NET.Build.Containers.csproj

@@ -9,8 +9,8 @@
       $(TargetsForTfmSpecificBuildOutput);CopyProjectReferencesToPackage
     </TargetsForTfmSpecificBuildOutput>
 
-    <!-- Tell the SDK to generate a deps.json file -->
-    <GenerateDependencyFile>true</GenerateDependencyFile>
+    <!-- Tell the SDK to generate a deps.json file to be used by .NET SDK MSBuild -->
+    <GenerateDependencyFile Condition=" '$(TargetFramework)' != 'net472'">true</GenerateDependencyFile>
 
     <!-- Allow the packaging project to use the name `Microsoft.NET.Build.Containers` for the nuget package -->
     <Packageid>.</Packageid>