Update build.yml disabling Poetry parallel install

Author: FedericoPivotto

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
       with:
         virtualenvs-create: true
         virtualenvs-in-project: true
-        installer-parallel: true # default option selected currently
+        installer-parallel: false # default option selected currently
     # Load cached environment, if it exists
     - name: Load cached poetry environment
       id: cached-poetry-dependencies