add advisory for procspawn: unmaintained

[ilka-schulz]

Affected crate(s)

• procspawn (39,334 recent downloads per crates.io)

Links to upstream issue(s) or PR(s)

• Is this crate still maintained? mitsuhiko/procspawn#58
• security issue: crate is affected by RUSTSEC-2025-0141 mitsuhiko/procspawn#57

Severity

• crate is unmaintained
• one dependency has been advised as "unmaintained" (RUSTSEC-2025-0141)

Checklist

• Advisory filename(s) starts with RUSTSEC-0000-0000 as the ID
• date field is set to the public disclosure date
• Contains a concise and descriptive title after advisory metadata
• Asked maintainer(s) if publishing an advisory is appropriate --> did not respond (v.s.)

[djc]

The maintainer assures me he intends to maintain it.