poetry install fails on Apple M-series (numpy pin, volesti build errors)

[Mohit-Lakra]

Trying to set up dingo on a macOS arm64 machine running Python 3.11, poetry install never finishes. The problems
I hit:

• [build-system] pins numpy==1.20.1, but that version doesn’t ship wheels for Python 3.11. Poetry’s build env gives up
  before it can even compile the package.
• volesti/external/PackedCSparse/FloatArray.h always includes <immintrin.h> and the MMCS samplers use .template in
  places modern clang won’t accept. On Apple Silicon that header doesn’t exist, so the compilation dies early.
• setup.py pushes -std=c++17 through the generic compiler args. The lp_solve C files then receive C++-only flags and
  clang aborts with “invalid argument '-std=c++17' not allowed with 'C'.”
• The lock file still points sparseqr at commit 42989e9 (v1.2.1), which lacks arm64 builds and fails against
  Homebrew’s SuiteSparse.

Together these make it impossible for new contributors on M-series Macs to install the project or run the tests.