Bump MessagePack from 1.7.3.7 to 1.9.3

Bumps [MessagePack](/~https://github.com/neuecc/MessagePack-CSharp) from 1.7.3.7 to 1.9.3.
- [Release notes](/~https://github.com/neuecc/MessagePack-CSharp/releases)
- [Commits](MessagePack-CSharp/MessagePack-CSharp@v1.7.3.7...v1.9.3)

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

fvim.fsproj

@@ -90,7 +90,7 @@
     </PackageReference>
     <PackageReference Include="HarfBuzzSharp" Version="1.4.6.2" />
     <PackageReference Include="HarfBuzzSharp.NativeAssets.Linux" Version="1.4.6.2" />
-    <PackageReference Include="MessagePack" Version="1.7.3.7" />
+    <PackageReference Include="MessagePack" Version="1.9.3" />
     <PackageReference Include="MessagePack.FSharpExtensions" Version="1.4.1" />
     <PackageReference Include="MessagePack.ImmutableCollection" Version="1.7.3.7" />
     <PackageReference Include="Microsoft.Win32.Registry" Version="4.5.0" />