Shallow git unshallow tags.

.github/workflows/sphinx.yml

@@ -17,7 +17,10 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
       with:
-        fetch-depth: 0  # Fetch all history for versioning to work
+        ref: feature/retrieve_doc
+
+    - name: Fetch tags
+      run: git fetch --prune --unshallow --tags
 
     - name: Install dependencies
       run: |