.Net: Removed System.Memory.Data dependency (#9970)

### Motivation and Context

<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->

Removed unused `System.Memory.Data` dependency from the solution.

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

---------

Co-authored-by: Chris <[email protected]>

dotnet/Directory.Packages.props

@@ -58,7 +58,6 @@
     <PackageVersion Include="System.IdentityModel.Tokens.Jwt" Version="7.5.1" />
     <PackageVersion Include="System.IO.Packaging" Version="8.0.1" />
     <PackageVersion Include="System.Linq.Async" Version="6.0.1" />
-    <PackageVersion Include="System.Memory.Data" Version="8.0.1" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="System.Numerics.Tensors" Version="8.0.0" />
     <PackageVersion Include="System.Text.Json" Version="8.0.5" />

dotnet/src/SemanticKernel.UnitTests/Extensions/ClientResultExceptionExtensionsTests.cs

@@ -64,7 +64,7 @@ public void ItProvideStatusForResponsesWithoutContent()
         // Assert
         Assert.NotNull(httpOperationException);
         Assert.NotNull(httpOperationException.StatusCode);
-        Assert.Empty(httpOperationException.ResponseContent!);
+        Assert.Null(httpOperationException.ResponseContent);
         Assert.Equal(exception, httpOperationException.InnerException);
         Assert.Equal(exception.Message, httpOperationException.Message);
         Assert.Equal(pipelineResponse.Status, (int)httpOperationException.StatusCode!);

dotnet/src/SemanticKernel.UnitTests/SemanticKernel.UnitTests.csproj

@@ -25,7 +25,6 @@
     <PackageReference Include="Microsoft.ML.Tokenizers" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" />
-    <PackageReference Include="System.Memory.Data" />
   </ItemGroup>
 
   <ItemGroup>