fix: update alternate infra (#76)

Author: neocybereth

default_infra_providers.json

@@ -1,8 +1,8 @@
 {
   "housefire": {
-    "rpc": "https://namada-housefire-rpc.emberstake.xyz",
-    "indexer": "https://namada-housefire-idx.emberstake.xyz",
-    "masp": "https://namada-housefire-masp-idx.emberstake.xyz"
+    "rpc": "https://rpc.testnet.siuuu.click",
+    "indexer": "https://indexer.testnet.siuuu.click",
+    "masp": "https://masp.testnet.siuuu.click"
   },
   "mainnet": {
     "rpc": "https://namada-rpc.emberstake.xyz",