Update versions: bitcoind 0.32.9, aztec 4.0.2, dshackle 0.75.11; update hashkeychain-testnet sequencer URL

Co-Authored-By: Claude Agent <claude@stakesquid.eu>

reference-rpc-endpoint.json

@@ -257,7 +257,7 @@
   "hashkey-testnet": {
     "id": 133,
     "urls": [
-      "https://hashkeychain-testnet.alt.technology"
+      "https://testnet.hsk.xyz"
     ]
   },
   "polygon": {
@@ -650,12 +650,6 @@
       "https://testrpc.xlayer.tech"
     ]
   },
-  "ronin-saigon": {
-    "id": 2021,
-    "urls": [
-      "https://ronin-testnet.gateway.tenderly.co"
-    ]
-  },
   "alephzero-sepolia": {
     "id": 2039,
     "urls": [
@@ -916,15 +910,13 @@
   "immutable-zkevm": {
     "id": 13371,
     "urls": [
-      "https://rpc.immutable.com",
-      "https://immutable-zkevm.drpc.org"
+      "https://rpc.immutable.com"
     ]
   },
   "immutable-zkevm-testnet": {
     "id": 13473,
     "urls": [
-      "https://rpc.testnet.immutable.com",
-      "https://immutable-zkevm-testnet.drpc.org"
+      "https://rpc.testnet.immutable.com"
     ]
   },
   "gravity-alpha-sepolia": {
@@ -1277,6 +1269,12 @@
       "https://rpc.hoodi.taiko.xyz"
     ]
   },
+  "ronin-saigon": {
+    "id": 2021,
+    "urls": [
+      "https://ronin-testnet.gateway.tenderly.co"
+    ]
+  },
   "filecoin-calibration": {
     "id": 314159,
     "urls": [