Update python versions

We removed python 3.7 and 3.8 from testing scope, as these versions are
not supported by github actions.

Author: cmeissner

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         phpipam-version: ['v1.4x', 'v1.5x']
-        python-version: ['3.7.x', '3.8.x', '3.9.x', '3.10.x']
+        python-version: ['3.9.x', '3.10.x', '3.11.x', '3.12.0', '3.13.0']
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2