ci: fix release workflow now uses .python-version

Author: tekumara

.github/workflows/release.yml

@@ -17,11 +17,9 @@ jobs:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           wait-interval: 5
       - uses: actions/checkout@v3
-      - name: Set up Python 3.7
+      - name: Set up Python
         id: setup-python
         uses: actions/setup-python@v4
-        with:
-          python-version: 3.7
       - name: Cache virtualenv
         id: cache-venv
         uses: actions/cache@v3