feat: use mempool.space endpoint for esplora client

Author: thunderbiscuit

app/src/main/java/org/bitcoindevkit/devkitwallet/domain/BlockchainClientsConfig.kt

@@ -41,7 +41,7 @@ class BlockchainClientsConfig {
             val config = BlockchainClientsConfig()
             when (network) {
                 Network.REGTEST  -> config.addClient(EsploraClient("http://10.0.2.2:3002"), true)
-                Network.SIGNET   -> config.addClient(EsploraClient("http://signet.bitcoindevkit.net"), true)
+                Network.SIGNET   -> config.addClient(EsploraClient("https://blockstream.info/signet/api/"), true)
                 Network.TESTNET  -> config.addClient(EsploraClient("https://blockstream.info/testnet/api/"), true)
                 Network.TESTNET4 -> config.addClient(EsploraClient("https://mempool.space/testnet4/api/"), true)
                 Network.BITCOIN  -> throw IllegalArgumentException("This app does not support mainnet")