Remove now-useless dependency

Remove this custom patch :
https://github.com/iExecBlockchainComputing/iexec-worker/blob/21c5956e6fdc719df2403d569151903cd722822c/build.gradle#L75
With latest we3bj :
https://github.com/web3j/web3j/commit/e04924c7f369587a9d4fed5141d53ae70552b856

(Do the same for all client repositories)