feat: update .NET target versions and dependencies

This commit updates the project to target .NET 8 and .NET 9, dropping the dependency on .NET 7. It also updates various package references to their latest versions. The version of SpiceDb has been bumped to 1.6.0 reflecting these changes.

BREAKING CHANGE: Dropped .NET 7 support and introduced new targets for .NET 8 and .NET 9

README.md

@@ -10,6 +10,9 @@ SpiceDb.net was created by Michael Tanczos and has contributions from Pavel Akim
 
 ## What's New?
 
+1.6.0
+- Dropped .NET 7 dependency and introduced new targets for .NET 8 and .NET 9
+
 1.5.3
 - BREAKING CHANGE: The constructors for `SpiceDbClient` now accept a nullable `schemaPrefix` instead of a required string. If not provided, it defaults to null.
 - @williamgraver added empty schema prefix handling for dedicated version of SpiceDb

SpiceDb.Example/SpiceDb.Example.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <UserSecretsId>3c39b9f0-8b22-4508-ae36-bdaccdb871ea</UserSecretsId>

SpiceDb.Tests/SpiceDb.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 
@@ -20,7 +20,7 @@
   <ItemGroup>
 	  <PackageReference Include="nunit" Version="4.1.0" />
 	  <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-	  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+	  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
   </ItemGroup>
 
   <ItemGroup>

SpiceDb/SpiceDb.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFrameworks>net8; net9</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 
@@ -15,7 +15,7 @@
 	<PackageIcon>logo.png</PackageIcon>
 	<PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
 	<PackageReadmeFile>README.md</PackageReadmeFile>
-	<Version>1.5.3</Version>
+	<Version>1.6.0</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
@@ -32,8 +32,8 @@
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
-		<PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
-		<PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.0" />
 		<PackageReference Include="YamlDotNet" Version="15.1.2" />
 	</ItemGroup>
 	<ItemGroup>