CI: bump test jobs' python version

Author: bsipocz

.github/workflows/ci_tests_run_notebooks.yml

@@ -32,14 +32,14 @@ jobs:
         name: ['with Python 3.12',]
 
         include:
-          - python-version: '3.9'
-            toxenv: py39-test-oldestdeps
-            name: with Python 3.9 and oldest versioned dependencies
+          - python-version: '3.10'
+            toxenv: py310-test-oldestdeps
+            name: with Python 3.10 and oldest versioned dependencies
             os: ubuntu-latest
 
-          - python-version: '3.12'
-            toxenv: py312-test-devdeps
-            name: with Python 3.12 and developer versioned dependencies
+          - python-version: '3.13'
+            toxenv: py313-test-devdeps
+            name: with Python 3.13 and developer versioned dependencies
             os: ubuntu-latest
 
     steps: