#3792 Leverage framework for dependencies (#3800)

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**What kind of change does this PR introduce?**
update

**What is the current behavior?**
Packages are the same for all TFM's

**What is the new behavior?**
Less dependencies are included for net 6+ due to them being available as
part of the framework

**What might this PR break?**
n/a

**Other information**:
closes #3792

src/ReactiveUI/ReactiveUI.csproj

@@ -25,11 +25,6 @@
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) ">
     <Compile Include="Platforms\netstandard2.0\**\*.cs" />
     <Compile Include="Platforms\shared\**\*.cs" />
-    <PackageReference Include="System.ComponentModel" />
-    <PackageReference Include="System.ComponentModel.Annotations" />
-    <PackageReference Include="System.Diagnostics.Contracts" />
-    <PackageReference Include="System.Dynamic.Runtime" />
-    <PackageReference Include="System.Runtime.Serialization.Primitives" />
   </ItemGroup>
   <ItemGroup Condition="$(TargetFramework.EndsWith('-ios')) or $(TargetFramework.EndsWith('-maccatalyst'))">
     <Compile Include="Platforms\apple-common\**\*.cs" />
@@ -54,11 +49,24 @@
   </ItemGroup>
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) or '$(TargetFramework)' == 'net6.0' or '$(TargetFramework)' == 'net7.0' or '$(TargetFramework)' == 'net8.0' or $(TargetFramework.EndsWith('-windows10.0.17763.0')) or $(TargetFramework.EndsWith('-windows10.0.19041.0')) ">
     <Compile Include="Platforms\net\**\*.cs" />
-    <PackageReference Include="System.ComponentModel.Annotations" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Splat" />
     <PackageReference Include="DynamicData" />
+  </ItemGroup>
+  <ItemGroup Condition="$(TargetFramework.StartsWith('net4'))">
+    <PackageReference Include="System.Text.Json" />
+    <PackageReference Include="System.ComponentModel.Annotations" />
+  </ItemGroup>
+  <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) ">
+    <PackageReference Include="System.ComponentModel" />
+    <PackageReference Include="System.ComponentModel.Annotations" />
+    <PackageReference Include="System.Diagnostics.Contracts" />
+    <PackageReference Include="System.Dynamic.Runtime" />
+    <PackageReference Include="System.Runtime.Serialization.Primitives" />
+    <PackageReference Include="System.Text.Json" />
+  </ItemGroup>
+  <ItemGroup Condition="$(TargetFramework.StartsWith('net6'))">
     <PackageReference Include="System.Text.Json" />
   </ItemGroup>
   <ItemGroup>