fix: Update AllowManageOwnAccessKeys statement

[vutny]

Description

The "AWS: Self-manage credentials with MFA (My security credentials)" reference policy got updated by AWS in the docs[1] and this implements the following correction:

The AllowManageOwnAccessKeys statement allows the user to create, update, and delete their own access keys. The user can also retrieve information about when the specified access key was last used.

1. https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_examples_aws_my-sec-creds-self-manage.html

Motivation and Context

Having the self-management policy up to date with AWS recommendations.

Breaking Changes

None.

How Has This Been Tested?

• [ ] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [x] 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

[vutny]

@antonbabenko , please review. Thanks in advance!

[antonbabenko]

This PR is included in version 5.30.2 :tada:

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