fix(ci): install pytestarch in docling-compat workflow

The daily docling-compat job manually installed only pytest, pytest-asyncio
and httpx, which made test_architecture.py fail with ModuleNotFoundError:
no module named 'pytestarch' — wrongly opening 'Docling compatibility break'
issues. Align with ci.yml by installing requirements-test.txt instead.

.github/workflows/docling-compat.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           python-version: "3.12"
           cache: pip
-          cache-dependency-path: document-parser/requirements.txt
+          cache-dependency-path: document-parser/requirements-test.txt
 
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y --no-install-recommends poppler-utils
@@ -35,8 +35,8 @@ jobs:
       - name: Install pinned dependencies
         run: |
           pip install --upgrade pip
-          pip install -r requirements.txt
-          pip install pytest pytest-asyncio httpx
+          pip install -r requirements-test.txt
+          pip install httpx
 
       - name: Upgrade docling to latest
         id: versions