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Here's a step-by-step guide on what you should do

Revoke Access Keys: Go to the AWS Management Console, navigate to the IAM service, and then to the "Users" section. Find your IAM user and delete any access keys that may have been exposed.

Rotate Credentials: If you have any other access keys or IAM roles associated with your account, consider rotating those credentials as well. This ensures that any compromised credentials are no longer valid.

Review IAM Policies: Check your IAM policies to ensure that they only grant the necessary permissions and do not inadvertently expose sensitive resources.

Delete Exposed Keys: Reach out to the git repository owner or administrator and request the immediate deletion of any exposed AWS keys from the repository's history.

Monitor Account Activity: Keep a close eye on your AWS account activity for any unauthorized access or unusual behavior. Set up CloudTrail logs and CloudWatch alarms to alert you to any suspicious activity.

Remember that exposure of AWS keys can lead to unauthorized access and potential security breaches, so it's crucial to act quickly to mitigate any risks. If you're unsure about any steps or need further assistance, consider reaching out to AWS Support for guidance.