Remove unused proxy field from workflow META.yaml

Deleted the 'proxy: PROXY' line from the generated META.yaml in the GitHub Actions workflow as it is no longer needed.

.github/workflows/run.yml

@@ -82,7 +82,6 @@ jobs:
           cat > publish/META.yaml << 'EOL'
           proxy-providers-defaults: &ppd
             type: http
-            proxy: PROXY
             interval: 86400
             health-check:
               enable: true