Bump MessagePack from 2.5.187 to 3.1.0

Bumps [MessagePack](https://github.com/MessagePack-CSharp/MessagePack-CSharp) from 2.5.187 to 3.1.0.
- [Release notes](https://github.com/MessagePack-CSharp/MessagePack-CSharp/releases)
- [Commits](MessagePack-CSharp/MessagePack-CSharp@v2.5.187...v3.1.0)

---
updated-dependencies:
- dependency-name: MessagePack
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Foundatio.MessagePack/Foundatio.MessagePack.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="2.5.187" />
+    <PackageReference Include="MessagePack" Version="3.1.0" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Foundatio\Foundatio.csproj" />