Update fiber-testnet.yml

Author: gpBlockchain

.github/workflows/fiber-testnet.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
       with: 
-        ref: gp/testnet-fiber
+        ref: gp/fiber-050
     - name: Set up Python 3.10
       uses: actions/setup-python@v3
       with: