This updates the default on new installations for rpc.pingomatic.com to use https while also upgrading existing sites that use rpc.pingomatic.com or rpc.twingly.com to use https for those two domains.
Reviewed by audrasjb.
Merges [60421] and [60422] to the 6.8 branch.
Props sabernhardt, peterwilsoncc, jorbin, bhubbard, matt.
Fixes#42007.
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