Forcing static type in VoxelComplex.ih

[dcoeurjo]

PR Description

See #1820

Checklist

• Unit-test of your feature with Catch.
• Doxygen documentation of the code completed (classes, methods, types, members...)
• Documentation module page added or updated.
• New entry in the ChangeLog.md added.
• No warning raised in Debug mode.
• All continuous integration tests pass (Github Actions)

[JacquesOlivierLachaud]

I have a cmake error with the current DGtal branches (both main and this one).

-- Configuring done (1.8s)
CMake Error in CMakeLists.txt:
  export called with target "DGtal" which requires target "Eigen3_Eigen" that
  is not in any export set.
-- Generating done (0.2s)
CMake Generate step failed.  Build files cannot be regenerated correctly.
make: *** [cmake_check_build_system] Error 1

This is probably linked to a former commit.

[dcoeurjo]

Yes it seems unrelated to this PR. Could you please fill up an issue with details on your OS/cmake version/ compiler... ?

It is fine on my computer and GitHub actions bots

[dcoeurjo]

I will merge this one.