build(deps): bump which from 7.0.2 to 8.0.5 - #708

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: mikehardy/runner-fallback-action@v1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/