Update network versions on README (#3126)

Automated version updates:
  - Fuel Ignition: 0.46.0
  - Testnet: 0.46.0
  - Devnet: 0.47.1

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Green Baneling <[email protected]>

Author: github-actions[bot]

README.md

@@ -15,7 +15,7 @@ Fuel client implementation.
 |----------|---------|
 | Fuel Ignition | 0.46.0 |
 | Testnet | 0.46.0 |
-| Devnet | 0.46.0 |
+| Devnet | 0.47.1 |
 
 ## Contributing