CI: dropping python 3.8 testing

Author: bsipocz

.github/workflows/ci_tests_run_notebooks.yml

@@ -19,21 +19,16 @@ jobs:
       matrix:
         # Run all supported OS for one Python version, then add a few extra scenarios
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.9']
-        toxenv: [py39-test]
-        name: ['with Python 3.9',]
+        python-version: ['3.10']
+        toxenv: [py310-test]
+        name: ['with Python 3.10',]
 
         include:
-          - python-version: '3.8'
+          - python-version: '3.9'
             toxenv: py38-test-oldestdeps
             name: with Python 3.8 and oldest versioned dependencies
             os: ubuntu-latest
 
-          - python-version: '3.10'
-            toxenv: py310-test
-            name: with Python 3.10
-            os: ubuntu-latest
-
           - python-version: '3.11'
             toxenv: py311-test-devdeps
             name: with Python 3.11 and developer versioned dependencies