Bump AWS provider required version

[renegaderyu]

Summary

Change aws required_providers version from >= 3.50 to >= 4.23

Description

The aws_elasticache_replication_group resource uses description and num_cache_clusters args for all new provider versions since 4.23. See https://registry.terraform.io/providers/hashicorp/aws/4.23.0/docs/resources/elasticache_replication_group. Prior to this there were mised uses of number_cache_clusters and replication_group_description. Even though the version requirement wasversion = ">= 3.50", it seems the module was built and tested w/ 4.46.

Type of change

• Bug fix

How Has This Been Tested?

I'm in the process of testing rollout of some cga proxies w/ our IT team.

Theses changes have been tested in:

• Local environment
• Development environment
• Staging environment
• Production environment

Checklist

• Fill the description
• Declare the type of changes included in the pull request
• Describe how has this been tested
• Add categorical labels (feature/fix/chore/docs/skip-changelog)
• Add semver labels (patch/minor/major/skip-semver)

[renegaderyu]

Another option is to segment branches/versions of this module for use with different AWS providers; though this would cause more overhead for the CGA team to maintain.

[renegaderyu]

@Evilong Another thing is that validation of the proxy tokens seems to fail because the expectation that proxy_auth_token= occurs in the string; However, new tokens generated by our IT dept. do not have this. I've added a commit to address this as well.

Edit: it seems the tokens were truncated by the communication mechanism. I've received new tokens that match the regex so I've removed that commit from this branch/PR.