This update for libqt5-qtwebengine fixes the following issues:

Update to version 5.15.10:

* Fix top level build with no widget
* Fix read-after-free on EGL extensions
* Update Chromium
* Add workaround for unstable gn on macOS in ci
* Pass archiver to gn build
* Fix navigation to non-local URLs
* Add support for universal builds for qtwebengine and qtpdf
* Enable Apple Silicon support
* Fix cross compilation x86_64->arm64 on mac
* Bump version to 5.15.10
* CustomDialogs: Make custom input fields readable in dark mode
* CookieBrowser: Make alternating rows readable in dark mode

* Update Chromium:
* Bump V8_PATCH_LEVEL
* Fix clang set-but-unused-variable warning
* Fix mac toolchain python linker script call
* Fix missing dependency for gpu sources
* Fix python calls
* Fix undefined symbol for universal link
* Quick fix for regression in service workers by reverting
backports
* [Backport] CVE-2022-0797: Out of bounds memory access
in Mojo
* [Backport] CVE-2022-1125
* [Backport] CVE-2022-1138: Inappropriate implementation
in Web Cursor.
* [Backport] CVE-2022-1305: Use after free in storage
* [Backport] CVE-2022-1310: Use after free in regular
expressions
* [Backport] CVE-2022-1314: Type Confusion in V8
* [Backport] CVE-2022-1493: Use after free in Dev Tools
* [Backport] On arm64 hosts, set host_cpu to 'arm64', not 'arm'
* [Backport] Security Bug 1296876
* [Backport] Security bug 1269999
* [Backport] Security bug 1280852
* [Backport] Security bug 1292905
* [Backport] Security bug 1304659
* [Backport] Security bug 1306507