fix: validation miss for mutable: true, until: mutate - #331

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: canonical/has-signed-canonical-cla@1c20438ad54b4d37105e777000545881d2293ba4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/