Use v0.5.0

Author: HawkiesZA

.github/workflows/ci.yaml

@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: praekeltfoundation/flow_tester
-          ref: locale-support
+          ref: v0.5.0
           path: flow_tester
           ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}