Fix s3 regex

[rezabekf]

What does this PR do and why?

This PR fixes regex for AllowedPatern in Parameters section of various templates.

The new pattern has been inspired by answer from StackOverflow to accommodate AWS documentation on Bucket naming rules

The pattern has been tested here https://regex101.com/r/pwH8T3/1 and test stack has been created to validate the pattern.

Issue #, if available

PR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• [ ] Added/Updated documentation if applicable.
• [x] Pre-commit checks passed.
• [x] Lint and Nag checks passed.
• [ ] If releasing a new version, have you bumped the version make version part=<major|minor|patch>?

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[rezabekf]

Is there somewhere this regex was copied from? If so, can we document where that is?

Good point Chris, I have updated PR description.