Release v6.2.7

What's Changed

• Stops __traverse__ from blocking on a busy cache lock so GC cannot deadlock under that lock. A skipped pass is safe because a held lock already keeps the cache reachable; adds regression tests across all cache types. (#86).
• CI now uses uv for Linux builds (faster, more architectures), and adds native riscv64 wheel builds via RISE runners (#89).
• Add missing py.typed file - it used to be present and was dropped by accident (#87).

Thanks to

• @threexc for #89.
• @akursar for #87
• @Malkiz223 for #86.

Full Changelog: v6.2.6...v6.2.7