MAINT: do not test Python 3.8 anymore

I did not add Python 3.13 to the support matrix yet because our environment requirements (Pydantic 1) are not supported anymore

Author: gdementen

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         # os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     defaults:
       run: