chore: increase max_nonce_ahead (#2896)

## What ❔

increases max_nonce_ahead in default config

## Why ❔

fix flaky test

## Checklist

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- [ ] PR title corresponds to the body of PR (we generate changelog
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- [ ] Tests for the changes have been added / updated.
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etc/env/file_based/general.yaml

@@ -36,7 +36,7 @@ api:
     filters_limit: 10000
     subscriptions_limit: 10000
     pubsub_polling_interval: 200
-    max_nonce_ahead: 20
+    max_nonce_ahead: 40
     gas_price_scale_factor: 1.5
     estimate_gas_scale_factor: 1.3
     estimate_gas_acceptable_overestimation: 5000