CI: Update used python

Author: deathaxe

.github/workflows/ci-lint.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         python:
-          - '3.8'
+          - '3.13'
         arch:
           - 'x64'
     steps:

.github/workflows/deploy-gh-pages.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.13'
       - name: Install MkDocs
         run: pip install -r docs/requirements.txt
       - name: Run MkDocs