github: Poetry cache clear needs -n to avoid interactive prompt

Author: bkeryan

.github/workflows/run_system_tests.yml

@@ -35,7 +35,7 @@ jobs:
             .tox
           key: run-system-tests-${{ runner.os }}-${{ matrix.configuration }}-${{ hashFiles('poetry.lock') }}
       - name: Clear Poetry cache
-        run: poetry cache clear PyPI --all
+        run: poetry cache clear PyPI --all -n
       - name: Install dependencies
         run: poetry install
       - name: Run system tests