Bump immutable from 5.1.5 to 5.1.9 - #2314

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/save@v4, actions/cache@v4, actions/checkout@v2, actions/setup-node@v1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'tab' is defined but never used

'changeInfo' is defined but never used

'tab' is defined but never used

'changeInfo' is defined but never used

'tab' is defined but never used

'changeInfo' is defined but never used

'tab' is defined but never used

'changeInfo' is defined but never used

'tab' is defined but never used