OpenFOAM does not compile with GCC and cpp20

Some class e.g. DiagonalMatrix, Compound ... raise the following compilation error:

OpenFOAM-v2312/src/OpenFOAM/lnInclude/token.H:336:21: error: expected unqualified-id before ‘const’
  336 |         Compound<T>(const Compound<T>&) = delete;
      |                     ^~~~~
OpenFOAM-v2312/src/OpenFOAM/lnInclude/token.H:336:21: error: expected ‘)’ before ‘const’
  336 |         Compound<T>(const Compound<T>&) = delete;
      |                    ~^~~~~
      |                     )

A fix was proposed by Mohammed Elwardi Fadeli and he created a Godbolt example:

https://godbolt.org/z/rcMG39Gaj

template<class T, class U>
class DiagMatrix
{
    // Clang compiles this (with all versions)
    // But Gcc does not
    //DiagMatrix<T, T>();

    // But this is probably not intended
    
    // This compiles with Gcc c++17
    // but not with Gcc c++20 or c++23
    DiagMatrix<T, U>();
    
    // All compilers will compile this though
    //DiagMatrix();
};

More details can be found here:

https://github.com/exasim-project/FoamAdapter/issues/2

To summarize the template arguments of the constructors/destructors needs to be removed:

Would it be possible to include the fix in upcoming release.

What is the workflow to merge these changes? Should we create a patch or will you create a branch for us where we can push the required changes?