deps(core): update dependency messagepack to 3.1.8 (#1186)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[MessagePack](https://redirect.github.com/MessagePack-CSharp/MessagePack-CSharp)
| `3.1.7` → `3.1.8` |
![age](https://developer.mend.io/api/mc/badges/age/nuget/MessagePack/3.1.8?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/MessagePack/3.1.7/3.1.8?slim=true)
|

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src/KubeOps.Aspire.Hosting/KubeOps.Aspire.Hosting.csproj

@@ -23,7 +23,7 @@
         <PackageReference Include="YamlDotNet" Version="18.1.0" />
         <!-- Pin transitive MessagePack (via Aspire.Hosting -> StreamJsonRpc) to a version
              without GHSA-hv8m-jj95-wg3x. Remove once Aspire ships a fixed StreamJsonRpc. -->
-        <PackageReference Include="MessagePack" Version="3.1.7" />
+        <PackageReference Include="MessagePack" Version="3.1.8" />
     </ItemGroup>
 
 </Project>