Changed ubuntu version for ci

Author: albop

.github/workflows/publish_to_test_pypi.yml

@@ -9,14 +9,14 @@ on:
 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 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: 3.9
 
     - name: Install pep517
       run: >-