[xcm-builder] Replaced deprecated CurrencyAdapter with FungibleAdapter (#3287)

I found out during the cleanup of this deprecation message in the
`polkadot-fellows` repository that we deprecated `CurrencyAdapter`
without making the recommended changes.


## TODO
- [ ] fix `polkadot-fellows` bump to 1.6.0
https://github.com/polkadot-fellows/runtimes/pull/159

---------

Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>

cumulus/parachains/integration-tests/emulated/tests/bridges/bridge-hub-westend/src/tests/asset_transfers.rs

@@ -182,13 +182,13 @@ fn send_rocs_from_asset_hub_westend_to_asset_hub_rococo() {
 			vec![
 				// ROC is withdrawn from AHW's SA on AHR
 				RuntimeEvent::Balances(
-					pallet_balances::Event::Withdraw { who, amount }
+					pallet_balances::Event::Burned { who, amount }
 				) => {
 					who: *who == sov_ahw_on_ahr,
 					amount: *amount == amount_to_send,
 				},
 				// ROCs deposited to beneficiary
-				RuntimeEvent::Balances(pallet_balances::Event::Deposit { who, .. }) => {
+				RuntimeEvent::Balances(pallet_balances::Event::Minted { who, .. }) => {
 					who: *who == AssetHubRococoReceiver::get(),
 				},
 				// message processed successfully

cumulus/parachains/integration-tests/emulated/tests/bridges/bridge-hub-westend/src/tests/mod.rs

@@ -67,7 +67,7 @@ pub(crate) fn assert_bridge_hub_westend_message_accepted(expected_processed: boo
 				BridgeHubWestend,
 				vec![
 					// pay for bridge fees
-					RuntimeEvent::Balances(pallet_balances::Event::Withdraw { .. }) => {},
+					RuntimeEvent::Balances(pallet_balances::Event::Burned { .. }) => {},
 					// message exported
 					RuntimeEvent::BridgeRococoMessages(
 						pallet_bridge_messages::Event::MessageAccepted { .. }