Bump StackExchange.Redis

Bumps the dotnet group in /docs/ai/how-to/snippets/semantic-kernel with 1 update: [StackExchange.Redis](https://github.com/StackExchange/StackExchange.Redis).


Updates `StackExchange.Redis` from 2.7.33 to 2.8.0
- [Release notes](https://github.com/StackExchange/StackExchange.Redis/releases)
- [Changelog](https://github.com/StackExchange/StackExchange.Redis/blob/main/docs/ReleaseNotes.md)
- [Commits](StackExchange/StackExchange.Redis@2.7.33...2.8.0)

---
updated-dependencies:
- dependency-name: StackExchange.Redis
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/ai/how-to/snippets/semantic-kernel/semantic-kernel.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="Microsoft.SemanticKernel.Connectors.AzureAISearch" Version="1.9.0-alpha" />
     <PackageReference Include="Microsoft.SemanticKernel.Connectors.Redis" Version="1.9.0-alpha" />
     <PackageReference Include="Microsoft.SemanticKernel.Plugins.Memory" Version="1.9.0-alpha" />
-    <PackageReference Include="StackExchange.Redis" Version="2.7.33" />
+    <PackageReference Include="StackExchange.Redis" Version="2.8.0" />
   </ItemGroup>
 
 </Project>