pyqt5: revision for qt5
pyqt5: revision for qt5

Qt 5.6.0 removed the `QtWebKit` module. Revision to avoid leaving users
with a no longer working `QtWebKit` module on the Python side.

Closes #50234.

Signed-off-by: Martin Afanasjew <54669547a225ff20cba8b75a4adca540eef25858@afanasjew.de>

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