fix: failing unit tests

[athith-g]

Issue 23 unit tests are failing. 22 tests fail due to connecting to the wrong db port here and here (should be using 27017).

Reproduce Run the following commands:

1. pip install -r requirements.txt
2. pip install -r requirements_dev.txt
3. cd examples/petstore-access-control
4. docker compose up -d
5. cd ../..
6. pytest tests