CVE-2025-58359 frost-core: refresh shares with smaller min_signers will reduce group security

ZF FROST is a Rust implementation of FROST Flexible Round-Optimised Schnorr Threshold signatures. In versions 2.0.0 through 2.1.0, refresh shares with smaller minsigners will reduce security of group. The inability to change minsigners i.e. the threshold with the refresh share functionality...