This update for libqt5-qtwebengine fixes the following issues:

Update to version 5.15.3

CVE fixes backported in chromium updates:

- CVE-2020-16044: Use after free in WebRTC
- CVE-2021-21118: Heap buffer overflow in Blink
- CVE-2021-21119: Use after free in Media
- CVE-2021-21120: Use after free in WebSQL
- CVE-2021-21121: Use after free in Omnibox
- CVE-2021-21122: Use after free in Blink
- CVE-2021-21123: Insufficient data validation in File System API
- CVE-2021-21125: Insufficient policy enforcement in File System API
- CVE-2021-21126: Insufficient policy enforcement in extensions
- CVE-2021-21127: Insufficient policy enforcement in extensions
- CVE-2021-21128: Heap buffer overflow in Blink
- CVE-2021-21129: Insufficient policy enforcement in File System API
- CVE-2021-21130: Insufficient policy enforcement in File System API
- CVE-2021-21131: Insufficient policy enforcement in File System API
- CVE-2021-21132: Inappropriate implementation in DevTools
- CVE-2021-21135: Inappropriate implementation in Performance API
- CVE-2021-21137: Inappropriate implementation in DevTools
- CVE-2021-21140: Uninitialized Use in USB
- CVE-2021-21141: Insufficient policy enforcement in File System API
- CVE-2021-21145: Use after free in Fonts
- CVE-2021-21146: Use after free in Navigation
- CVE-2021-21147: Inappropriate implementation in Skia
- CVE-2021-21148: Heap buffer overflow in V8
- CVE-2021-21149: Stack overflow in Data Transfer
- CVE-2021-21150: Use after free in Downloads
- CVE-2021-21152: Heap buffer overflow in Media
- CVE-2021-21153: Stack overflow in GPU Process
- CVE-2021-21156: Heap buffer overflow in V8
- CVE-2021-21157: Use after free in Web Sockets

This update was imported from the openSUSE:Leap:15.2:Update update project.