Fix deploy workflow (#24)

Author: nboissinot

.github/workflows/test_build_and_push.yml

@@ -38,7 +38,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.7'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install needed packages to push new version on PyPi
         run: |