Remove Python 3.8 from CI and add 3.12

Author: facutuesca

.github/workflows/tests.yml

@@ -11,10 +11,10 @@ jobs:
     strategy:
       matrix:
         python:
-          - "3.8"
           - "3.9"
           - "3.10"
           - "3.11"
+          - "3.12"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3