Support AWS_EC2_METADATA_V1_DISABLED env variable

[stanhu]

This was added in the upstream AWS library: aws/aws-sdk-ruby#2924

I think credential_fetcher would needed to be updated to avoid GET requests (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html) and only use PUT requests.

[geemus]

Thanks for the heads up. Definitely happy to support this work, but also definitely haven't been actively using EC2 in a very, very long time (so I don't feel confident/prepared to do the work myself).

[github-actions]

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