client-tcp-checker: use HTTPS for cmdns.dev.dns-oarc.net requests

dns-violations / dnsflagday

DNS flag day

https://dnsflagday.net/

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Closed pspacek closed 4 years ago

pspacek commented 4 years ago

This fixes test failure in Firefox 70: Blocked loading mixed display content "http://cmdns.dev.dns-oarc.net/dot.png"

jelu commented 4 years ago

@pspacek You broke the test now, subdomain.cmdns.dev.dns-oarc.net needs to be HTTP