gateway: bump aws-actions/configure-aws-credentials from 4.1.0 to 4.2.1

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/dummy.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5  # v5.5.0
       - uses: addnab/docker-run-action@4f65fabd2431ebc8d299f8e5a018d79a769ae185  # v3
       - uses: amondnet/vercel-action@16e87c0a08142b0d0d33b76aeaf20823c381b9b9  # v25.2.0
-      - uses: aws-actions/configure-aws-credentials@ececac1a45f3b08a01d2dd070d28d111c5fe6722  # v4.1.0
+      - uses: aws-actions/configure-aws-credentials@b47578312673ae6fa5b5096b330d9fbac3d116df  # v4.2.1
       - uses: azure/setup-helm@b9e51907a09c216f16ebe8536097933489208112  # v4.3.0
       - uses: betahuhn/repo-file-sync-action@8b92be3375cf1d1b0cd579af488a9255572e4619  # v1
       - uses: bnjbvr/cargo-machete@5eaad10acf89fb0c6a31d9b197a2d48ba762d28e  # v0.7.0