Updated publish-to-test-pypi.yml

changed runs on to ubuntu-latest

Author: extinctsion

.github/workflows/publish-to-test-pypi.yml

@@ -5,7 +5,7 @@ on: push
 jobs:
   build-n-publish:
     name: Build and publish Python 🐍 distributions 📦 to PyPI and TestPyPI
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
     - name: Set up Python 3.9