<commit_before>### SDK Features

### SDK Enhancements
* `aws/credentials`: `PolicyArns` can now be passed in to `stscreds.AssumeRoleProvider` in the same way as `sts.AssumeRoleInput`.

### SDK Bugs<commit_msg>Update CHANGELOG_PENDING.md to reflect changes to web identity role provider<commit_after>### SDK Features

### SDK Enhancements
* `aws/credentials`: `PolicyArns` can now be passed in to `stscreds.AssumeRoleProvider` and `stscreds.WebIdentityRoleProvider` in the same way as `sts.AssumeRoleInput`.

### SDK Bugs
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