fix: pin python version for sphinx

.github/workflows/deploy-userguide-latest.yml

@@ -33,11 +33,20 @@ jobs:
           php-version: '8.1'
           coverage: none
 
-      # Build the latest User Guide
-      - name: Build with Sphinx
-        uses: ammaraskar/sphinx-action@0.4
+      - name: Setup Python
+        uses: actions/setup-python@v5
         with:
-          docs-folder: user_guide_src/
+          python-version: '3.12'
+
+      - name: Install Sphinx
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r user_guide_src/requirements.txt
+
+      # Build the latest User Guide
+      - name: Build Docs with Sphinx
+        run: make html
+        working-directory: user_guide_src
 
       - name: Add "Edit this page" links
         run: |

.github/workflows/test-userguide.yml

@@ -26,10 +26,19 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install Sphinx
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r user_guide_src/requirements.txt
+
       - name: Detect usage of tabs in RST files
         run: php utils/check_tabs_in_rst.php
 
-      - uses: ammaraskar/sphinx-action@0.4
-        with:
-          docs-folder: user_guide_src
-          build-command: 'make html SPHINXOPTS="-W --keep-going -w /tmp/sphinx-log"'
+      - name: Build Docs with Sphinx
+        run: make html SPHINXOPTS="-W --keep-going -w /tmp/sphinx-log"
+        working-directory: user_guide_src