feat!: Upgrade AWS provider and min required Terraform version to 6.0 and 1.5.7 respectively

[schniber]

Description

• Terraform v1.5.7 is now minimum supported version
• AWS provider v6.0.0 is now minimum supported version
• Support for region parameter to specify the AWS region for the resources created if different from the provider region.
• any variable types have been replaced with full variable definitions using optional() variable attributes

Motivation and Context

• Recent AWS provider major version v6.0 support, along with the addition of specifying region in resources without having to use aliased providers

Breaking Changes

• Yes, besides the min supported versions:
  • key_statements.conditions has been changed to key_statement.condition to match the underlying API
  • grants.constraints support multiple constraints and therefore its type has been changed to a list. You can simply wrap your current constraints in brackets ([]) to resolve any diffs; see the updated example in this PR

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects
• I have executed pre-commit run -a on my pull request

[schniber]

Hello team,

Thanks a lot for your review.

Let me know if there's anything to fix / change.

Bests.

[bryantbiggs]

thank you - this is a breaking change and given that the provider is very recent, we will probably wait to see the level of stability and what other changes need to be made here as part of a breaking change before this is merged

[schniber]

Perfect thanks @bryantbiggs, yes that's wise. let's wait and see.
At least this will be there and ready :)

[bryantbiggs]

thank you!

[antonbabenko]

This PR is included in version 4.0.0 🎉

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