Maintenance: Update year in documentation

[dreamorosi]

Summary

The documentation footer has the current year in the footer, which should now be updated to 2023.

Why is this needed?

Because it's January 1st 2023

Which area does this relate to?

Other

Solution

No response

Acknowledgment

• This request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Python, Java

[github-actions]

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