chore(deps): update dependency Microsoft.NETFramework.ReferenceAssemblies to v1.0.3 (#17)

Author: renovate[bot]

Directory.Build.props

@@ -6,7 +6,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies">
-      <Version>1.0.0</Version>
+      <Version>1.0.3</Version>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.SourceLink.GitHub">