`provide_credentials` span should be debug level

[jdisanti]

Discussed in #652

This should be a debug_span:
https://github.com/awslabs/smithy-rs/blob/374a0a25f83f5bae92bfac785cf783891bbb1937/aws/rust-runtime/aws-config/src/default_provider/credentials.rs#L73

[github-actions]

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[jdisanti]

The fix for this will go out with the next release.

[jdisanti]

This was included in release-2022-12-14.