Removes deprecated attributes from S3Bucket

[desertaxle]

Removes the following deprecated attributes from the S3Bucket block:

• basepath
• aws_crednetials
• minio_credentials

Adds a basepath property in order to maintain compatibility with storage block based deployments.

Checklist

• References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• Includes tests or only affects documentation.
• Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• Includes screenshots of documentation updates.
  • Run mkdocs serve view documentation locally.
• Summarizes PR's changes in CHANGELOG.md

[zzstoatzz]

lgtm!