[Clone] Use https in docs

[felipe-gdr]

https://www.graphql-java.com/documentation/v14/getting-started/ should replace http://dl.bintray.com with https://dl.bintray.com

See https://max.computer/blog/how-to-take-over-the-computer-of-any-java-or-clojure-or-scala-developer/

As suggested in this graphql-java issue: graphql-java/graphql-java#1873