v0.48.0-sec.3 fixes CVE-2026-39832 for Go v1.24

What's Changed

• [Go 1.24.0] CVE-2026-39832: ssh/agent: reject keys with unsupported confirm constraint by @Atharva-Shinde in #11

Full Changelog: v0.48.0-sec.2...v0.48.0-sec.3