CI: Run lint on Python 3.12

bokeh/bokeh#14289 (comment)

Author: kernc

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         python-version: ['3.10', 3.13]
         include:
-          - python-version: 3.11
+          - python-version: 3.12
             test-type: lint
           - python-version: 3.11
             test-type: docs