gh actions: update deploy script

.github/workflows/deploy.yml

@@ -7,17 +7,34 @@ name: Deploy Package
 on: [push]
 
 jobs:
-  build:
-
-    runs-on: ubuntu-latest
+  build-n-publish:
+    name: Build and publish Python 🐍 distributions 📦 to PyPI and TestPyPI
+    runs-on: ubuntu-18.04
 
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
-    - uses: casperdcl/deploy-pypi@v2
+    - uses: actions/checkout@master
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.9
+
+    - name: Install pypa/build
+      run: >-
+        python -m
+        pip install
+        build
+        --user
+    - name: Build a binary wheel and a source tarball
+      run: >-
+        python -m
+        build
+        --sdist
+        --wheel
+        --outdir dist/
+        .
+    - name: Publish distribution 📦 to PyPI
+      if: startsWith(github.ref, 'refs/tags')
+      uses: pypa/gh-action-pypi-publish@master
       with:
         user: ${{ secrets.PYPI_USERNAME }}
         password: ${{ secrets.PYPI_TOKEN }}
-        pip: wheel -w dist/ --no-deps .
-           # only upload if a tag is pushed (otherwise just build & check)
-        upload: ${{ github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags') }}