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Works fine here. In case it was a temporary hickup, try again, eventually with

--refresh-dependencies

in case Gradle remembers it didn't find it. If it still does not work, double-check you do not have some firewall, virus scanner, proxy, or similar intervening. I suspect the latter, especially as the IP from your message is some Indian IP, not one of the official IPs for

<http://raw.githubusercontent.com|raw.githubusercontent.com>

.