Update project files to target .NET 8.0 and adjust copyright years and language versions

Author: rprouse

src/todo.application/todo.application.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>Todo.Application</AssemblyName>
     <RootNamespace>Alteridem.Todo.Application</RootNamespace>
     <Company>Alteridem Consulting</Company>
     <Product>Todo.txt command line utility application library</Product>
-    <Copyright>Copyright (c) 2023 Rob Prouse</Copyright>
-    <LangVersion>10</LangVersion>
+    <Copyright>Copyright (c) 2025 Rob Prouse</Copyright>
+    <LangVersion>12</LangVersion>
   </PropertyGroup>
 
   <!-- Make Internals visible to the unit tests -->

src/todo.domain/todo.domain.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>Todo.Domain</AssemblyName>
     <RootNamespace>Alteridem.Todo.Domain</RootNamespace>
     <Company>Alteridem Consulting</Company>
     <Product>Todo.txt command line utility domain library</Product>
-    <Copyright>Copyright (c) 2023 Rob Prouse</Copyright>
-    <LangVersion>10</LangVersion>
+    <Copyright>Copyright (c) 2025 Rob Prouse</Copyright>
+    <LangVersion>12</LangVersion>
   </PropertyGroup>
 
 </Project>

src/todo.infrastructure/DependencyInjection.cs

@@ -23,7 +23,7 @@ public static IServiceCollection AddInfrastructure(this IServiceCollection servi
                     var options = new JsonSerializerOptions
                     {
                         AllowTrailingCommas = true,
-                        IgnoreNullValues = true,
+                        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
                         ReadCommentHandling = JsonCommentHandling.Skip,
                         PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
                         WriteIndented = true

src/todo.infrastructure/todo.infrastructure.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>Todo.Infrastructure</AssemblyName>
     <RootNamespace>Alteridem.Todo.Infrastructure</RootNamespace>
     <Company>Alteridem Consulting</Company>
     <Product>Todo.txt command line utility infrastructure library</Product>
-    <Copyright>Copyright (c) 2023 Rob Prouse</Copyright>
-    <LangVersion>10</LangVersion>
+    <Copyright>Copyright (c) 2025 Rob Prouse</Copyright>
+    <LangVersion>12</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

src/todo/todo.csproj

@@ -8,18 +8,19 @@
     <Authors>Rob Prouse</Authors>
     <Company>Alteridem Consulting</Company>
     <Product>Todo.txt command line utility</Product>
-    <Copyright>Copyright (c) 2024 Rob Prouse</Copyright>
+    <Copyright>Copyright (c) 2025 Rob Prouse</Copyright>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://github.com/rprouse/dotnet-todo</PackageProjectUrl>
     <RepositoryUrl>https://github.com/rprouse/dotnet-todo</RepositoryUrl>
     <PackageReadmeFile>Readme.md</PackageReadmeFile>
     <PackageId>dotnet-todo</PackageId>
-    <Version>0.6.4</Version>
+    <Version>0.7.0</Version>
     <PackAsTool>true</PackAsTool>
     <ToolCommandName>todo</ToolCommandName>
     <PackageOutputPath>./nupkg</PackageOutputPath>
     <RepositoryType>git</RepositoryType>
     <Description>dotnet-todo is a .NET command line port of http://todotxt.org/ that tries to remain faithful to the command line and functionality of the original shell script wherever possible.</Description>
+    <LangVersion>12</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

tests/todo.tests/todo.tests.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>net8.0</TargetFramework>
     <IsPackable>false</IsPackable>
     <RootNamespace>Alteridem.Todo.Tests</RootNamespace>
+    <LangVersion>12</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>