Drop PostgreSQL 14 support - #73

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: github/codeql-action/upload-sarif@3c3833e0f8c1c83d449a7478aa59c036a9165498. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/