Document setting up local dev env with same Poetry version as CI
Add to `DEVELOPER_GUIDE` docs how to set up local development environment with Poetry version 1.4.2, the same as in CI.

Fix #1565.
Document setting up local dev env with same Poetry version as CI: Add to `DEVELOPER_GUIDE` docs how to set up local development environment with Poetry version 1.4.2, the same as in CI.

Fix #1565.