upgrade node to polkadot v1.6.0

upgrade distance oracle to polkadot v1.6.0

upgrade end2end tests

upgrade xtask to polkadot v1.6.0

update repository paths to duniter polkadot v1.6.0

fix nodes/rust/duniter-v2s#131

optimize end2end test

fix review errors

update subxt branch

update test comment