Bump Microsoft.NETFramework.ReferenceAssemblies from 1.0.0 to 1.0.3

---
updated-dependencies:
- dependency-name: Microsoft.NETFramework.ReferenceAssemblies
  dependency-version: 1.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

netfx_loader/ClrLoader.csproj

@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="NXPorts" Version="1.0.0" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Condition="$(MSBuildRuntimeType) == 'Core'">
-      <Version>1.0.0</Version>
+      <Version>1.0.3</Version>
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>