Version 0.8.6

[jrenaud90]

Major Changes:

• Added support for Python 3.12.
• Converted CySolver's rk_step method into a pure-c implementation to allow for further optimizations.
• Changed all files to compile with c rather than c++.
  • Had to change cpp_bools to bints to make this change.

Bug Fixes:

• Fixed issue where CyRK was not installing on MacOS due to issue with LLVM and OpenMP.
  • Have opted to go to gcc for macOS install due to issues with OpenMP and clang.
• Fixed incorrect type for rk method in CySolver (should eliminate some compile warnings).
• Fixed issue in benchmark where incorrect results were being displayed for CySolver.