chore(clients): remove direct dependency on client-sts

[trivikr]

Issue

Noticed while working on https://github.com/aws/aws-sdk-js-v3/pull/6027

The clients required direct dependency on client-sts earlier, since they imported decorateDefaultCredentialProvider. This is no longer required, since the import was removed in https://github.com/aws/aws-sdk-js-v3/pull/5681

The utilities in client-sts are now imported from individual credential providers:

• https://github.com/aws/aws-sdk-js-v3/blob/fbf863878009c74d88fe0f6d48e8bc0ff8bf1cd5/packages/credential-providers/src/loadSts.ts#L1
• https://github.com/aws/aws-sdk-js-v3/blob/fbf863878009c74d88fe0f6d48e8bc0ff8bf1cd5/packages/credential-provider-web-identity/src/loadSts.ts#L1

Description

Removes redundant direct dependency on client-sts from all clients

Testing

CI

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