[GitHub Request] Set the CODECOV_TOKEN secret on opensearch-rs

[Xtansia]

What is the type of request?

Secret Update

Details of the request

Please configure the opensearch-rs repository secrets to include the CODECOV_TOKEN as specified here.

Additional information to support your request

Repository was previously using tokenless/OIDC for codecov uploads which is now disabled, as such test workflows are now failing.

When does this request need to be completed?

non-urgent as repository has low PR throughput

Notes

Track the progress of your request here: https://github.com/orgs/opensearch-project/projects/208/views/33.
Member of @opensearch-project/admin will take a look at the request soon.
Thanks!

[peterzhuamazon]

Updated CODECOV_TOKEN per request in opensearch-rs repo.

Thanks.