Upgrade everything to recent python versions

* drop python 2 support, as this is not easily possible anymore with the
  ubuntu-latest github actions runner

Author: tom-mi

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [2.7, 3.6, 3.7, 3.8]
+        python: [3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13, 3.14]
 
     steps:
       - uses: actions/checkout@v2

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.8
+          python-version: 3.13
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip