Drop redundant pypi release workflow

This workflow was added mistakenly. It doesn't work and is redundant:
publishing is handled already by the poetry-publish workflow.

.github/workflows/release.yml

@@ -1,27 +0,0 @@
-name: Release on PyPI
-
-on:
-  push:
-    tags:
-    - v*
-
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x'
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install setuptools wheel twine
-    - name: Build and publish
-      env:
-        TWINE_USERNAME: __token__
-        TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
-      run: |
-        python setup.py sdist bdist_wheel
-        twine upload dist/*