chore: downgrading python in ci for consistency (#2722)

the docs aren't building on github because a valid version of `didkit` won't install, and I think it might be because we upgraded Python to bleeding edge but only for the `ci` workflows.

Author: deborahgu

.github/workflows/ci.yml

@@ -76,7 +76,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: "3.11"
           architecture: x64
       - name: Install Dependencies
         run: make requirements