Follow Nexus API: add consensus account num_txns

Update to version:
   "add consensus account num_txns"
   (from 2024.05.22)

- New data:
  - Account.stats
- Changed:
  - AccountStats.total_received and total_sent is now optional

.changelog/1433.internal.md

@@ -0,0 +1 @@
+Follow nexus: add consensus account num_txns

src/oasis-nexus/orval.config.js

@@ -5,8 +5,8 @@ import removeNetworkFromName from './removeNetworkFromName.js'
 const config = {
   nexus: {
     input: {
-      // target: './v1.yaml',
-      target: 'https://raw.githubusercontent.com/oasisprotocol/nexus/main/api/spec/v1.yaml',
+      target: './v1.yaml',
+      // target: 'https://raw.githubusercontent.com/oasisprotocol/nexus/main/api/spec/v1.yaml',
       // target: 'https://nexus.stg.oasis.io/v1/spec/v1.yaml',
       // target: 'https://nexus.oasis.io/v1/spec/v1.yaml',
       override: {