Upgrade to polkadot-v1.7.1

Upgrade note:

• MaxHold was deleted from pallet_balances.

To do:

• Upgrade duniter-polkadot-sdk.
• Upgrade duniter subxt.
• Upgrade node.

resources/weight_analyzer/src/lib.rs

@@ -187,7 +187,7 @@ mod tests {
                 .get("Balances")
                 .unwrap()
                 .len()
-                == 7
+                == 8
         ); // 7 extrinsics in pallet
         println!("{:?}", weight_by_pallet); // cargo test  -- --nocapture
     }