Bump ModelContextProtocol from 0.3.0-preview.2 to 0.3.0-preview.4 (#17897)

Updated
[ModelContextProtocol](https://github.com/modelcontextprotocol/csharp-sdk)
from 0.3.0-preview.2 to 0.3.0-preview.4.

<details>
<summary>Release notes</summary>

_Sourced from [ModelContextProtocol's
releases](https://github.com/modelcontextprotocol/csharp-sdk/releases)._

## 0.3.0-preview.4

## What's Changed
* Respect HandleResponse() and SkipHandler() calls in
OnResourceMetadataRequest by @​halter73 in
modelcontextprotocol/csharp-sdk#607
* UnreferenceDisposable made slimmer by @​Scooletz in
modelcontextprotocol/csharp-sdk#627
* IdleTracking uses lists instead of SortedSet by @​Scooletz in
modelcontextprotocol/csharp-sdk#629
* Fix ResourceLinkBlock deserialization by adding missing "name" case by
@​Copilot in modelcontextprotocol/csharp-sdk#645
* Add an in-memory transport sample by @​stephentoub in
modelcontextprotocol/csharp-sdk#664
* Remove 'Sse' from AspNetCoreSseServer sample name by @​halter73 in
modelcontextprotocol/csharp-sdk#665
* Fix NotSupportedException when returning IEnumerable<ContentBlock> by
@​Copilot in modelcontextprotocol/csharp-sdk#675
* Enhance HTTP and MCP session logging by @​theojiang25 in
modelcontextprotocol/csharp-sdk#608
* Remove special-casing of string enumerables in McpServerTool by
@​stephentoub in
modelcontextprotocol/csharp-sdk#699
* Prune idle sessions before starting new ones by @​halter73 in
modelcontextprotocol/csharp-sdk#701
* Add framework for conceptual docs by @​mikekistler in
modelcontextprotocol/csharp-sdk#708

## New Contributors
* @​Scooletz made their first contribution in
modelcontextprotocol/csharp-sdk#627
* @​Copilot made their first contribution in
modelcontextprotocol/csharp-sdk#645
* @​theojiang25 made their first contribution in
modelcontextprotocol/csharp-sdk#608

**Full Changelog**:
modelcontextprotocol/csharp-sdk@v0.3.0-preview.3...v0.3.0-preview.4

## 0.3.0-preview.3

## What's Changed
* Enable netfx testing. by @​eiriktsarpalis in
modelcontextprotocol/csharp-sdk#588
* fix: Prevent crash when Options.ResourceMetadata is null but handled
by event by @​DavidParks8 in
modelcontextprotocol/csharp-sdk#603
* Update to M.E.AI 9.7.0 by @​stephentoub in
modelcontextprotocol/csharp-sdk#602
* Ensure IsExternalInit is type forwarded on NET builds by @​stephentoub
in modelcontextprotocol/csharp-sdk#619
* Flow ExecutionContext with JsonRpcMessage by @​halter73 in
modelcontextprotocol/csharp-sdk#616
* Update MEAI version and add regression test for #​601. by
@​eiriktsarpalis in
modelcontextprotocol/csharp-sdk#628

## New Contributors
* @​DavidParks8 made their first contribution in
modelcontextprotocol/csharp-sdk#603

**Full Changelog**:
modelcontextprotocol/csharp-sdk@v0.3.0-preview.2...v0.3.0-preview.3

Commits viewable in [compare
view](modelcontextprotocol/csharp-sdk@v0.3.0-preview.2...v0.3.0-preview.4).
</details>

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src/Directory.Packages.props

@@ -75,7 +75,7 @@
     <PackageVersion Include="Microsoft.VisualStudio.Workspace" Version="17.1.11-preview-0002" />
     <PackageVersion Include="Microsoft.VisualStudio.Workspace.VSIntegration" Version="17.1.11-preview-0002" />
     <PackageVersion Include="Microsoft.Visualstudio.Telemetry" Version="17.12.48" />
-    <PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview.2" />
+    <PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview.4" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="Newtonsoft.Json.Schema" Version="4.0.1" />