Outdated and vulnerable v8 is used

[kxxt]

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The javascript engine v8, version 8.9(used in https://github.com/ONLYOFFICE/build_tools/blob/master/scripts/core_common/modules/v8_89.py) is very outdated and vulnerable.

It should be updated to a recent version or have security patches backported.

For reference, qt5-webengine uses chromium 87 and v8 8.7 with some added security patches. The commits are available here: https://github.com/qt/qtwebengine-chromium/commits/87-based/