Updates subtensor branch for e2e

Author: ibraheem-abe

.github/workflows/e2e-subtensor-tests.yaml

@@ -90,7 +90,7 @@ jobs:
 
       - name: Setup subtensor repo
         working-directory: ${{ github.workspace }}/subtensor
-        run: git checkout testnet
+        run: git checkout main
 
       - name: Run tests
         run: |