fix: avoid http3 for dns.google and www.google.com #593
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Description
This diff changes code the release/3.11 branch to ensure we're not using dns.google and www.google.com over HTTP3. As documented in ooni/probe#1873, since this morning (approx) these services do not support HTTP3 anymore. (I didn't bother with checking whether this issue affects other Google services; I just limited my analysis to the services that we were using as part of testing.)
This patch WILL require forward porting to the master branch.