Update package references. Fixes dependabot warnings

Author: commonsensesoftware

src/Directory.Build.targets

@@ -12,6 +12,10 @@
   <Import Project="..\build\nuget.targets" />
  </ImportGroup>
 
+ <ItemGroup Condition="$(MSBuildProjectName.Contains('Microsoft.AspNet.'))">
+  <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies.$(TargetFramework)" Version="1.0.3" PrivateAssets="All" />
+ </ItemGroup>
+
  <Target Name="GetTargetPath" Outputs="$(TargetPath)" />
 
  <Target Name="GetTargetPaths" Outputs="@(TargetFiles)">

src/Microsoft.AspNet.OData.Versioning.ApiExplorer/Microsoft.AspNet.OData.Versioning.ApiExplorer.csproj

@@ -22,10 +22,6 @@
   <ProjectReference Include="..\Microsoft.AspNet.WebApi.Versioning.ApiExplorer\Microsoft.AspNet.WebApi.Versioning.ApiExplorer.csproj" />
  </ItemGroup>
 
- <ItemGroup>
-  <PackageReference Include="microsoft.netframework.referenceassemblies.net45" Version="1.0.2" PrivateAssets="All" />
- </ItemGroup>
-
  <ItemGroup>
   <Reference Include="Microsoft.CSharp" />
   <Reference Include="System" />

src/Microsoft.AspNet.OData.Versioning/Microsoft.AspNet.OData.Versioning.csproj

@@ -17,7 +17,6 @@
 
  <ItemGroup>
   <PackageReference Include="Microsoft.AspNet.OData" Version="[7.5.14,8.0.0)" />
-  <PackageReference Include="microsoft.netframework.referenceassemblies.net45" Version="1.0.2" PrivateAssets="All" />
  </ItemGroup>
 
  <ItemGroup>

src/Microsoft.AspNet.WebApi.Versioning.ApiExplorer/Microsoft.AspNet.WebApi.Versioning.ApiExplorer.csproj

@@ -19,10 +19,6 @@
   <ProjectReference Include="..\Microsoft.AspNet.WebApi.Versioning\Microsoft.AspNet.WebApi.Versioning.csproj" />
  </ItemGroup>
 
- <ItemGroup>
-  <PackageReference Include="microsoft.netframework.referenceassemblies.net45" Version="1.0.2" PrivateAssets="All" />
- </ItemGroup>
-
  <ItemGroup>
   <Reference Include="System" />
   <Reference Include="Microsoft.CSharp" />

src/Microsoft.AspNet.WebApi.Versioning/Microsoft.AspNet.WebApi.Versioning.csproj

@@ -13,7 +13,6 @@
 
  <ItemGroup>
   <PackageReference Include="Microsoft.AspNet.WebApi.Core" Version="[5.2.3,6.0.0)" />
-  <PackageReference Include="microsoft.netframework.referenceassemblies.net45" Version="1.0.2" PrivateAssets="All" />
  </ItemGroup>
 
  <ItemGroup>