Build only net10.0 to prevent different target frameworks from writing
concurrently to the shared output directory used by dotnet-pkg.

--- a/src/Shared.msbuild
+++ b/src/Shared.msbuild
@@ -1,7 +1,7 @@
 <Project>
   <!-- General package metadata -->
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
+    <TargetFrameworks>net10.0</TargetFrameworks>
     <PackageId>$(AssemblyName)</PackageId>
     <Copyright>Copyright (c) .NET Foundation and contributors</Copyright>
     <Authors>Patrik Svensson, Mattias Karlsson, Gary Ewan Park, Alistair Chapman, Martin Björkström, Dave Glick, Pascal Berger, Jérémie Desautels, Enrico Campidoglio, C. Augusto Proiete, Nils Andresen, and contributors</Authors>
--- a/tests/integration/Cake.Frosting/build/Build.csproj
+++ b/tests/integration/Cake.Frosting/build/Build.csproj
@@ -3,4 +3,4 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
+    <TargetFrameworks>net10.0</TargetFrameworks>
     <PackAsTool>true</PackAsTool>