Fix minos-cli new microservice template

[Rey092]

minos-cli 0.4.0 Quickstart doesn't work.

microservice-testmicroservice_1  | Traceback (most recent call last):
microservice-testmicroservice_1  |   File "/usr/local/bin/microservice", line 5, in <module>
microservice-testmicroservice_1  |     from src.cli import main
microservice-testmicroservice_1  |   File "/usr/local/lib/python3.9/site-packages/src/__init__.py", line 5, in <module>
microservice-testmicroservice_1  |     from .aggregates import (
microservice-testmicroservice_1  |   File "/usr/local/lib/python3.9/site-packages/src/aggregates.py", line 5, in <module>
microservice-testmicroservice_1  |     from minos.aggregate import (
microservice-testmicroservice_1  | ImportError: cannot import name 'RootEntity' from 'minos.aggregate' (/usr/local/lib/python3.9/site-packages/minos/aggregate/__init__.py)

[Rey092]

Looks like problem with new prereleases. Maybe minos-cli should create new templates with 'allow-prereleases' set to false (in pyproject.toml).