Update to WebKitGTK 2.34:
- Add support for CSS Scroll Snap.
- Add support for date and datetime-local input elements.
- Add support for display capture.
- Add support for ICC color management.
- Add support color-schemes CSS property.
- Add multi-track support to MSE media backend.
- Add new API to handle web process unresponsiveness.
- Add API to disable CORS on a web view for particular domains.
- Add new API to access/modify capture devices states.
- Add new API to configure the memory pressure handler.
- Security fixes: CVE-2021-30846, CVE-2021-30851, CVE-2021-42762