[breaking] Update pdfjs-dist to 4.0.379

[wojtekmaj]

Closes #1664

Breaking changes:

• Changed extension in workerSrc
• Dropped support for svg renderMode
• Dropped support for browsers not supporting structuredClone (e.g. Chrome <98) unless polyfilled

Blockers:

• Setup must support top level await. See https://github.com/mozilla/pdf.js/issues/17245 for details.