Replace deprecated random_shuffle with std::shuffle in Polygon_mesh_processing

[LOTUS9679]

Summary of Changes

Replaced CGAL::cpp98::random_shuffle with std::shuffle in Polygon_mesh_processing/self_intersections.h.
std::random_shuffle is deprecated in C++14 and removed in C++17.
Also replaced the incompatible CGAL::Random generator with std::default_random_engine to support std::shuffle.

Release Management

• Affected package(s): Polygon_mesh_processing
• Issue(s) solved (if any):
• Feature/Small Feature (if any):
• Link to compiled documentation (obligatory for small feature):
• License and copyright ownership: I confirm this contribution is under the repository's license.

[MaelRL]

See #9214 (comment).