[main] Update dependencies from nuget/nuget.client (#12972)

This pull request updates the following dependencies

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## From https://github.com/nuget/nuget.client
- **Subscription**:
[e61ebb2e-41b3-4d00-9d65-5ff5253f9a59](https://maestro.dot.net/subscriptions?search=e61ebb2e-41b3-4d00-9d65-5ff5253f9a59)
- **Build**:
[7.3.0.50](https://dev.azure.com/devdiv/DevDiv/_build/results?buildId=13019612)
([295751](https://maestro.dot.net/channel/8705/github:nuget:nuget.client/build/295751))
- **Date Produced**: December 30, 2025 6:44:23 AM UTC
- **Commit**:
[a99b70cf718ff7842466a7eaeefa99b471cad517](NuGet/NuGet.Client@a99b70c)
- **Branch**: [dev](https://github.com/nuget/nuget.client/tree/dev)

[DependencyUpdate]: <> (Begin)

- **Dependency Updates**:
  - From [7.3.0-preview.1.43 to 7.3.0-preview.1.50][1]
     - NuGet.Build.Tasks

[1]:
NuGet/NuGet.Client@cc8f616...a99b70c

[DependencyUpdate]: <> (End)


[marker]: <> (End:e61ebb2e-41b3-4d00-9d65-5ff5253f9a59)

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Author: dotnet-maestro[bot]

eng/Version.Details.props

@@ -27,7 +27,7 @@ This file should be imported by eng/Versions.props
     <MicrosoftDotNetArcadeSdkPackageVersion>10.0.0-beta.25626.5</MicrosoftDotNetArcadeSdkPackageVersion>
     <MicrosoftDotNetXUnitExtensionsPackageVersion>10.0.0-beta.25626.5</MicrosoftDotNetXUnitExtensionsPackageVersion>
     <!-- nuget/nuget.client dependencies -->
-    <NuGetBuildTasksPackageVersion>7.3.0-preview.1.43</NuGetBuildTasksPackageVersion>
+    <NuGetBuildTasksPackageVersion>7.3.0-preview.1.50</NuGetBuildTasksPackageVersion>
     <!-- dotnet/roslyn dependencies -->
     <MicrosoftNetCompilersToolsetPackageVersion>5.3.0-2.26051.1</MicrosoftNetCompilersToolsetPackageVersion>
   </PropertyGroup>

eng/Version.Details.xml

@@ -110,9 +110,9 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>d8dca0b41b903e7182e64543773390b969dab96b</Sha>
     </Dependency>
-    <Dependency Name="NuGet.Build.Tasks" Version="7.3.0-preview.1.43">
+    <Dependency Name="NuGet.Build.Tasks" Version="7.3.0-preview.1.50">
       <Uri>https://github.com/nuget/nuget.client</Uri>
-      <Sha>cc8f616db8da1c2feb052c2d7eb5cd73071da290</Sha>
+      <Sha>a99b70cf718ff7842466a7eaeefa99b471cad517</Sha>
     </Dependency>
     <Dependency Name="Microsoft.Net.Compilers.Toolset" Version="5.3.0-2.26051.1">
       <Uri>https://github.com/dotnet/roslyn</Uri>