fix: prysm vc (#533)

src/cl/prysm/prysm_launcher.star

@@ -150,7 +150,7 @@ def launch(
 
     beacon_http_endpoint = "{0}:{1}".format(beacon_service.ip_address, HTTP_PORT_NUM)
     beacon_rpc_endpoint = "{0}:{1}".format(beacon_service.ip_address, RPC_PORT_NUM)
-    beacon_http_url = beacon_http_endpoint
+    beacon_http_url = beacon_rpc_endpoint
     # TODO(old) add validator availability using the validator API: https://ethereum.github.io/beacon-APIs/?urls.primaryName=v1#/ValidatorRequiredApi | from eth2-merge-kurtosis-module
     beacon_node_identity_recipe = GetHttpRequestRecipe(
         endpoint="/eth/v1/node/identity",