The http test data hasn't always been stable but for some reason
it fails far more than usual.
Originally the domain was a non-existing one, because it would then work
on any machine (even if not in CI) and would finish() (with error)
after failing to look up the domain in DNS. However, some machines in CI,
for some reason, take too long to do this and end up failing the test.
So, we change the URL to point to the network server in CI. This should,
at the very least, finish quickly when running in CI.
Pick-to: 6.3 6.2 5.15
Fixes: QTBUG-102952
Change-Id: I3b3f6fa23acf78fefdb69ff9ae7722f15e5f1736
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
b322984b49