Docs: Change installation from CDK v1 to CDK v2

[keithrozario]

What were you searching in the docs?

The installation steps for Powertools using CDK.

Is this related to an existing documentation section?

https://docs.powertools.aws.dev/lambda/python/latest/#cdk

How can we improve?

Changing the example to support CDK v2 instead. The current steps here will fail on CDK v2.

Got a suggestion in mind?

Change import statements and initializers to CDK v2 formats. :)

#4351

Acknowledgment

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

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.
In the meantime, check out the #python channel on our Powertools for AWS Lambda Discord: Invite link

[leandrodamascena]

Thanks for opening this issue @keithrozario!

[github-actions]

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