Bump aws-actions/configure-aws-credentials in /actions/update-link-index (#1266)

Bumps [aws-actions/configure-aws-credentials](https://github.com/aws-actions/configure-aws-credentials) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/aws-actions/configure-aws-credentials/releases)
- [Changelog](https://github.com/aws-actions/configure-aws-credentials/blob/main/CHANGELOG.md)
- [Commits](aws-actions/configure-aws-credentials@ececac1...b475783)

---
updated-dependencies:
- dependency-name: aws-actions/configure-aws-credentials
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

actions/update-link-index/action.yml

@@ -42,7 +42,7 @@ runs:
           with open(os.environ["GITHUB_OUTPUT"], "a") as f:
             f.write(f"result=arn:aws:iam::{aws_account_id}:role/{prefix}{hash}")
     - name: Configure AWS Credentials
-      uses: aws-actions/configure-aws-credentials@ececac1a45f3b08a01d2dd070d28d111c5fe6722 # v4.1.0
+      uses: aws-actions/configure-aws-credentials@b47578312673ae6fa5b5096b330d9fbac3d116df # v4.2.1
       with:
         role-to-assume: ${{ steps.role_arn.outputs.result }}
         aws-region: us-east-1