Update network versions on README (#3046)

Automated version updates:
  - Fuel Ignition: 0.43.2
  - Testnet: 0.44.0
  - Devnet: 0.44.0

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

Author: github-actions[bot]

README.md

@@ -14,7 +14,7 @@ Fuel client implementation.
 | Network  | Version |
 |----------|---------|
 | Fuel Ignition | 0.43.2 |
-| Testnet | 0.43.2 |
+| Testnet | 0.44.0 |
 | Devnet | 0.44.0 |
 
 ## Contributing