CHORE: Test workaround for Poetry bug

- Got an issue while installing project dependencies on Python 3.12 on CI.
  Workaround proposed in python-poetry/poetry#7611.

Author: truhanen

.github/actions/setup/action.yml

@@ -19,5 +19,7 @@ runs:
           cache: "poetry"
 
       - name: Install dependencies
-        run: poetry install
+        run: |
+          poetry config installer.max-workers 1
+          poetry install
         shell: bash