Change working directory of tox run

Author: Thiyagu55

.github/workflows/python-unit-tests.yaml

@@ -29,3 +29,5 @@ jobs:
         run: pip install -U tox-factor
       - name: run tox
         run: tox -e '${{ matrix.python-version }}-{django21,psycopg2,flask}'
+        working-directory: ./python/sqlcommenter-python
+