gnd: Don't unset nullable primitive fields set to 0 or false - #6760

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, extractions/setup-crate@v1, pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/