Bump target framework down to .NET 8

Author: khellang

EFCore.Sqlite.NodaTime/EFCore.Sqlite.NodaTime.csproj

@@ -5,7 +5,7 @@
     <RootNamespace>Microsoft.EntityFrameworkCore.Sqlite</RootNamespace>
     <AssemblyName>EntityFrameworkCore.Sqlite.NodaTime</AssemblyName>
     <PackageId>EntityFrameworkCore.Sqlite.NodaTime</PackageId>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
 
     <MinVerTagPrefix>v</MinVerTagPrefix>
   </PropertyGroup>