sdk/docs: Bump versions for sphinx dependencies

Currently, the sphinx dependencies in `docs/add_requirements.txt` are
outdated, causing our CI pipeline to fail.

This bumps the versions for the additional requirements for the
compilation of the documentation to their newest working state.
Since that version needs `Python >= 3.11`, we also need to bump the
version of Python used in the CI.

Fixes #385

Author: s-heppner

.github/workflows/ci.yml

@@ -154,10 +154,10 @@ jobs:
         working-directory: ./sdk
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python ${{ env.X_PYTHON_MIN_VERSION }}
+    - name: Set up Python ${{ env.X_PYTHON_MAX_VERSION }}
       uses: actions/setup-python@v5
       with:
-        python-version: ${{ env.X_PYTHON_MIN_VERSION }}
+        python-version: ${{ env.X_PYTHON_MAX_VERSION }}
     - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip

sdk/docs/add-requirements.txt

@@ -1,4 +1,4 @@
 # Additional requirements for building the docs
-sphinx~=7.2
-sphinx-rtd-theme~=2.0
-sphinx-argparse~=0.4.0
+sphinx~=8.2
+sphinx-rtd-theme~=3.0
+sphinx-argparse~=0.5.0