Update tests to use Electrum v4.6.2

- Update `electrumd` to support newer Electrum releases

  The changes in `electrumd` can be reviewed here: https://github.com/shesek/electrumd/compare/b35d9db285d932cb3c2296beab65e571a2506349..e22e864d1ce2ebbf02f1e3fee1ac846ab54bcafd

- Update to new JSON response format for `onchain_history`

- Electrum v4.6 appears to process new blocks/transactions significantly
  slower compared to v4.5. This initially required increasing the
  sleep() in `notify_wallet` up to several seconds for the tests to
  pass, however I found that there's a new `wait_for_rpc` command
  that can be used instead: spesmilo/electrum@f3551f3

Author: shesek

Cargo.lock

@@ -79,7 +79,7 @@ electrs_macros = { path = "electrs_macros", default-features = false }
 [dev-dependencies]
 corepc-node = { version = "0.10", features = ["download", "29_0"] }
 elementsd = { version = "0.11", features = ["22_1_1"] }
-electrumd = { version = "0.1.0", features = ["4_5_4"] }
+electrumd = { version = "0.1.0", features = ["4_6_2"] }
 ureq = { version = "3.1", default-features = false, features = ["json"] }
 tempfile = "3.10"
 criterion = { version = "0.8", features = ["html_reports"] }
@@ -103,4 +103,4 @@ rev = "d3792352992a539afffbe11501d1aff9fd5b919d"            # add-peer branch
 # not yet published on crates.io
 [patch.crates-io.electrumd]
 git = "https://github.com/shesek/electrumd"
-rev = "b35d9db285d932cb3c2296beab65e571a2506349"
+rev = "e22e864d1ce2ebbf02f1e3fee1ac846ab54bcafd"

Cargo.toml

@@ -37,6 +37,7 @@ fn test_electrum() -> Result<()> {
     let notify_wallet = || {
         electrum_server.notify();
         std::thread::sleep(std::time::Duration::from_millis(200));
+        electrum_wallet.call("wait_for_sync", &json!([])).unwrap();
     };
 
     let assert_balance = |confirmed: f64, unconfirmed: f64| {
@@ -108,18 +109,18 @@ fn test_electrum() -> Result<()> {
     let history = electrum_wallet.call("onchain_history", &json!([]))?;
     log::debug!("history = {:#?}", history);
     assert_eq!(
-        history["transactions"][0]["txid"].as_str(),
+        history[0]["txid"].as_str(),
         Some(txid1.to_string().as_str())
     );
-    assert_eq!(history["transactions"][0]["height"].as_u64(), Some(102));
-    assert_eq!(history["transactions"][0]["bc_value"].as_str(), Some("0.1"));
+    assert_eq!(history[0]["height"].as_u64(), Some(102));
+    assert_eq!(history[0]["bc_value"].as_str(), Some("0.1"));
 
     assert_eq!(
-        history["transactions"][1]["txid"].as_str(),
+        history[1]["txid"].as_str(),
         Some(txid2.to_string().as_str())
     );
-    assert_eq!(history["transactions"][1]["height"].as_u64(), Some(103));
-    assert_eq!(history["transactions"][1]["bc_value"].as_str(), Some("0.2"));
+    assert_eq!(history[1]["height"].as_u64(), Some(103));
+    assert_eq!(history[1]["bc_value"].as_str(), Some("0.2"));
 
     // Send an outgoing payment
     electrum_wallet.call(