(GH-4060) Update Microsoft.NETCore.Platforms to 7.0.0

* fixes #4060

Author: devlead

src/Cake.NuGet/Cake.NuGet.csproj

@@ -28,7 +28,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NETCore.Platforms" Version="7.0.0-rc.2.22472.3" GeneratePathProperty="true">
+    <PackageReference Include="Microsoft.NETCore.Platforms" Version="7.0.0" GeneratePathProperty="true">
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
     <EmbeddedResource Include="$(PkgMicrosoft_NETCore_Platforms)\runtime.json">