Docs: Replace poetry subcommand to add dev deps

[leandrodamascena]

What were you searching in the docs?

Poetry changed and deprecated the --dev subcommand to define dev dependencies and we need to update the documentation.

Is this related to an existing documentation section?

https://awslabs.github.io/aws-lambda-powertools-python/

How can we improve?

Update documentation to use the new Poetry command:

poetry add <deps_name> --group <group_name>

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[leandrodamascena]

This is now released under 2.8.0 version!

[github-actions]

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