Bump postcss from 8.5.10 to 8.5.18 in /src/Indice.Features.Cases.App - #1122

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/dependency-review-action@3c4e3dcb1aa7874d2c16be7d79418e9b7efd6261, step-security/harden-runner@20cf305ff2072d973412fa9b1e3a4f227bda3c76. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/