Bump ModelContextProtocol and ModelContextProtocol.AspNetCore (#805)

Updated
[ModelContextProtocol](https://github.com/modelcontextprotocol/csharp-sdk)
from 0.3.0-preview.3 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

Commits viewable in [compare
view](modelcontextprotocol/csharp-sdk@v0.3.0-preview.3...v0.3.0-preview.4).
</details>

Updated
[ModelContextProtocol.AspNetCore](https://github.com/modelcontextprotocol/csharp-sdk)
from 0.3.0-preview.3 to 0.3.0-preview.4.

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

_Sourced from [ModelContextProtocol.AspNetCore'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

Commits viewable in [compare
view](modelcontextprotocol/csharp-sdk@v0.3.0-preview.3...v0.3.0-preview.4).
</details>

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Directory.Packages.props

@@ -42,8 +42,8 @@
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" />
     <PackageVersion Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="9.0.0" />
-    <PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview.3" />
-    <PackageVersion Include="ModelContextProtocol.AspNetCore" Version="0.3.0-preview.3" />
+    <PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview.4" />
+    <PackageVersion Include="ModelContextProtocol.AspNetCore" Version="0.3.0-preview.4" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="System.CommandLine" Version="2.0.0-beta6.25358.103" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />