feat(layers): add new regions

[am29d]

Description of your changes

I have added three new regions:

• eu-south-2
• eu-central-2
• ap-southeast-4

in test and prod accounts. I have also bumped the layer version to the same level, current level 8.

I had to fix the pre-push hook, otherwise I couldn't create the PR.

How to verify this change

Related issues, RFCs

Issue number: #1169

PR status

Is this ready for review?: YES
Is it a breaking change?: NO

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding changes to the examples
• My changes generate no new warnings
• The code coverage hasn't decreased
• I have added tests that prove my change is effective and works
• New and existing unit tests pass locally and in Github Actions
• Any dependent changes have been merged and published
• The PR title follows the conventional commit semantics

Breaking change checklist

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[dreamorosi]

Thank you for the PR Alex, could you please also update the docs with the new ARNs (both versions & new regions)?

[dreamorosi]

Also could you please document under this PR the high level steps needed to onboard a new region, aside from the ones in the diff? I.e. CDK bootstrap the new region, etc.

This way next time if you are not available another maintainer can do it.

[dreamorosi]

We have the layer version also at the following lines of the main page: L29, 77, 108, 140, 192, 210, 234, 244, 250

[am29d]

Added docs. Surprisingly, many regions undocumented existed before, so it does look like we added more regions.

[dreamorosi]

Thanks for working on this Alex, appreciate it!

And good spot for the missing regions!