ci: update region denylist for lambda layers

[marofke]

Problem

Lambda layers were failing to publish with:

UnrecognizedClientException: The security token included in the request is invalid

It turns out this error was caused by lambda layers trying to be added to new AWS regions, which are deactivated by default. See a list of new regions here: https://docs.aws.amazon.com/accounts/latest/reference/manage-acct-regions.html

Solution

Updated the deny list of regions to attempt publishing lambda layers to, as new regions have been added since the last RFDK release. Added a log statement so it's clear which region has failed.

Testing

• recreated the error attempting to publish to my account
• successfully published and wrote lambda layers to my account

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