docs: python 3.13.5 (#1771)

prerequisite to #1770

we need python >= 3.11 since that's what our internal pypi supports
(getsentry/pypi#1610)

Author: joshuarli

.github/workflows/ci.yml

@@ -152,7 +152,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.13.5
 
       - name: Setup python dependencies
         run: pip install --upgrade mkdocs mkdocs-material pygments

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.13.5
 
       - name: Setup python dependencies
         run: pip install --upgrade mkdocs mkdocs-material pygments