fix(deps): security updates

[hyperpolymath]

Dependabot Rust security remediation (personal-sysadmin/Cargo.lock)

Fixed

• rand: 0.9.2 -> 0.9.3 (low severity advisory; patched in-range via cargo update).

Flagged — not auto-fixable

• hickory-proto (medium, patched 0.26.1): blocked. Current 0.25.2 is locked by libp2p-mdns 0.48.0 -> libp2p 0.56.0, whose requirement is ^0.25.2. The patched 0.26.1 is a MAJOR bump outside the range, so cargo update cannot reach it without a manifest major upgrade of libp2p. needs-manual-major (0.25.2 -> 0.26.1).
• hickory-proto (high, patched NONE): no-patch-available — no fixed version exists upstream for this advisory. Updating to 0.26.1 (even if libp2p were bumped) is not guaranteed to address it.

No Cargo.toml or checksum hand-edits were made. Do not merge until reviewed.