Add advisory for libafl_bolts out-of-bounds access

[lewismosciski]

This PR adds an advisory for a soundness issue in libafl_bolts.

Summary

The safe functions covmap_is_interesting_simd and covmap_is_interesting_naive can cause undefined behavior through out-of-bounds memory access.

Details

• Vulnerability: Use get_unchecked on hist slice with indices from map slice
• Impact: Out-of-bounds access when hist.len() < map.len(), causing undefined behavior
• Status: ✅ Fixed in main branch, awaiting release
• Fix: Functions marked as unsafe with safety documentation

[lewismosciski]

Hi @domenukk,

Per RustSec policy, could you please confirm you're okay with publishing this advisory for the soundness issue AFLplusplus/LibAFL#3417?

Thanks!