Remove Python 3.7, add 3.12 to tests

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       max-parallel: 5
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"] # in line with Napalm base project
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}