Maintenance release: adds 3.12 support, fixes a segfault

What's Changed

• updated local fork of crdp to work with Python 3.12 (plasma-umass/crdp@3010015)
• fixed #614 via update to Heap-Layers (emeryberger/Heap-Layers@851ebf4)
• fixed: add astunparser to python<3.9 wheel by @victorbadenas in #604

New Contributors

• @victorbadenas made their first contribution in #604

Full Changelog: v1.5.21.2...v1.5.21.3