Update Python dependencies in CI workflow to include httpx

Author: PierreRaybaut

.github/workflows/test.yml

@@ -46,7 +46,7 @@ jobs:
     - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install ruff pytest pytest-cov
+        python -m pip install ruff pytest pytest-cov httpx
         python -m pip install PyQt5
 
     - name: Install DataLab and dependencies