4.0.0

• Update the collection version to 4.0.0.
• Use Python 3.12 for testing.
• Use ansible-core 2.16.5 for testing.
• Update amazon.aws dependency to version 7.x.
• Use amazon.aws.iam_role instead of community.aws.iam_role for testing.
• Drop community.aws test dependency.
• Fix module defaults in documentation.
• Fix test assertions to not use templates.
• Update distlib test dependency to version 0.3.8.