Docs: remove Node.js 12 deprecation notice

[dreamorosi]

What were you searching in the docs?

The docs have a banner at the top that was introduced several weeks ago to announce that the project would end support for Node.js 12. Now that v1.5.1 is out, and support has officially ended, we can remove the notice.

Is this related to an existing documentation section?

https://awslabs.github.io/aws-lambda-powertools-typescript/latest/

How can we improve?

Remove the notice.

Got a suggestion in mind?

No response

Acknowledgment

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

[github-actions]

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