Fix #15060 Nullptr dereference in exprDependsOnThis() - #8894

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: hendrikmuhs/[email protected]. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/