Bump NStack.Core from 1.0.5 to 1.0.7

Bumps [NStack.Core](https://github.com/gui-cs/NStack) from 1.0.5 to 1.0.7.
- [Release notes](https://github.com/gui-cs/NStack/releases)
- [Commits](https://github.com/gui-cs/NStack/compare/v1.0.5...v1.0.7)

---
updated-dependencies:
- dependency-name: NStack.Core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Terminal.Gui/Terminal.Gui.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="all" />
-    <PackageReference Include="NStack.Core" Version="1.0.5" />
+    <PackageReference Include="NStack.Core" Version="1.0.7" />
     <InternalsVisibleTo Include="UnitTests" />
   </ItemGroup>
   <!-- Uncomment the RestoreSources element to have dotnet restore pull NStack from a local dir for testing -->