Migrate to new self-hosted mempool.space instance (#1820)

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_bitcoin/lib/electrum_wallet.dart

@@ -1707,7 +1707,7 @@ abstract class ElectrumWalletBase
         try {
           final blockHash = await http.get(
             Uri.parse(
-              "http://mempool.cakewallet.com:8999/api/v1/block-height/$height",
+              "https://mempool.cakewallet.com/api/v1/block-height/$height",
             ),
           );
 
@@ -1716,7 +1716,7 @@ abstract class ElectrumWalletBase
               jsonDecode(blockHash.body) != null) {
             final blockResponse = await http.get(
               Uri.parse(
-                "http://mempool.cakewallet.com:8999/api/v1/block/${blockHash.body}",
+                "https://mempool.cakewallet.com/api/v1/block/${blockHash.body}",
               ),
             );
             if (blockResponse.statusCode == 200 &&

cw_core/lib/get_height_by_date.dart

@@ -270,7 +270,7 @@ const bitcoinDates = {
 Future<int> getBitcoinHeightByDateAPI({required DateTime date}) async {
   final response = await http.get(
     Uri.parse(
-      "http://mempool.cakewallet.com:8999/api/v1/mining/blocks/timestamp/${(date.millisecondsSinceEpoch / 1000).round()}",
+      "https://mempool.cakewallet.com/api/v1/mining/blocks/timestamp/${(date.millisecondsSinceEpoch / 1000).round()}",
     ),
   );
 

lib/view_model/transaction_details_view_model.dart

@@ -159,7 +159,7 @@ abstract class TransactionDetailsViewModelBase with Store {
       case WalletType.monero:
         return 'https://monero.com/tx/${txId}';
       case WalletType.bitcoin:
-        return 'https://mempool.space/${wallet.isTestnet ? "testnet/" : ""}tx/${txId}';
+        return 'https://mempool.cakewallet.com/${wallet.isTestnet ? "testnet/" : ""}tx/${txId}';
       case WalletType.litecoin:
         return 'https://blockchair.com/litecoin/transaction/${txId}';
       case WalletType.bitcoinCash: