Tech debt: add `from __future__ import annotations` in the Data Masking feature

[sthulb]

Why is this needed?

Reference: #4607

Add from future import annotations to all files, including examples

Which area does this relate to?

Automation

Solution

No response

Acknowledgment

• This request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET