Bump MessagePack from 2.4.59 to 2.5.108

Bumps [MessagePack](https://github.com/neuecc/MessagePack-CSharp) from 2.4.59 to 2.5.108.
- [Release notes](https://github.com/neuecc/MessagePack-CSharp/releases)
- [Changelog](https://github.com/neuecc/MessagePack-CSharp/blob/master/prepare_release.ps1)
- [Commits](MessagePack-CSharp/MessagePack-CSharp@v2.4.59...v2.5.108)

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

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

src/examples/CustomSerialization.MsgPack/CustomSerialization.MsgPack.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\..\common.props" />
 
   <PropertyGroup>
@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MessagePack" Version="2.4.59" />
+    <PackageReference Include="MessagePack" Version="2.5.108" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(TargetFramework)' == '$(NetFrameworkTestVersion)' ">