Bump Microsoft.NETFramework.ReferenceAssemblies from 1.0.2 to 1.0.3 (#1958)

Bumps [Microsoft.NETFramework.ReferenceAssemblies](https://github.com/Microsoft/dotnet) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/Microsoft/dotnet/releases)
- [Commits](https://github.com/Microsoft/dotnet/commits)

---
updated-dependencies:
- dependency-name: Microsoft.NETFramework.ReferenceAssemblies
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tig Kindel <[email protected]>

Terminal.Gui/Terminal.Gui.csproj

@@ -16,7 +16,7 @@
     <InformationalVersion>1.0</InformationalVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.2" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="all" />
     <PackageReference Include="NStack.Core" Version="0.17.1" />
     <InternalsVisibleTo Include="UnitTests" />
   </ItemGroup>