Update main.yml

Author: ahartikainen

.github/workflows/main.yml

@@ -26,7 +26,9 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install poetry
-        run: pip install "poetry~=1.1.4"
+        run: |
+          python -m pip install pip setuptools -U
+          pip install "poetry~=1.1.4"
 
       # export test dependencies from pyproject.toml, install them
       - name: Install dependencies