pyqt5: replace QtWebKit with QtWebEngine in test
pyqt5: replace QtWebKit with QtWebEngine in test

The `QtWebKit` module has been deprecated for quite a while and was
finally removed in Qt 5.6.0. Adapt test to use its successor instead.

Closes #50227.

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

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