update: p11-kit

**Name**: p11-kit
**CVEs**: [CVE-2026-2100](https://www.cve.org/CVERecord?id=CVE-2026-2100)
**CVSSs**: n/a
**Action Needed**: update to >= 0.26.2

**Summary**: rpc: fix NULL dereference via C_DeriveKey with specific NULL parameters

**refmap.gentoo**: https://bugs.gentoo.org/969878
