add net9.0 to gh action

Author: Jack-Keene

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
           dotnet build
 
       - name: Insert build files into Unity projects
-        working-directory: SnowplowTracker/SnowplowTracker/bin/Debug/netstandard2.0
+        working-directory: SnowplowTracker/SnowplowTracker/bin/Debug/net9.0
         run: |
           find . -name \*.dll -and -not -name UnityEngine.dll -and -not -name Newtonsoft.Json.dll -exec cp {} ../../../../../SnowplowTracker.Demo/Assets/Plugins/SnowplowTracker/ \;
           find . -name \*.dll -and -not -name UnityEngine.dll -and -not -name Newtonsoft.Json.dll -exec cp {} ../../../../../SnowplowTracker.Tests/Assets/Plugins/SnowplowTracker/ \;

SnowplowTracker/SnowplowTracker/SnowplowTracker.csproj

@@ -52,6 +52,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="LiteDB" Version="5.0.20" />
+    <PackageReference Include="MessagePack" Version="3.1.3" />
     <PackageReference Include="MessagePack.UnityShims" Version="3.1.3" />
   </ItemGroup>
 </Project>