feat(opensearch): OpenSearch 2.11 engine version

[watany-dev]

Amazon OpenSearch Service now supports OpenSearch version 2.11

In the old 2.9 PR, the Readme.md was not updated, so I have not done it this time either.
#27612

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[cgarvis]

Can you add 2.10 quickly as well?

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[vinayak-kukreja]

Hey, thank you for this contribution. It looks good to me.

I have added 2.10 to this PR as well.

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