Update release_test_pypi_before_merge.yml

Author: BurkeHulk

.github/workflows/release_test_pypi_before_merge.yml

@@ -13,7 +13,7 @@ jobs:
   build-n-publish:
     if: github.event_name == 'workflow_dispatch' || github.repository == 'hpcaitech/ColossalAI'
     name: Build and publish Python 🐍 distributions 📦 to Test PyPI
-    runs-on: [self-hosted, ubuntu-latest]
+    runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
     - uses: actions/checkout@v2