fix(bedrock): handle role:"system" inside the messages array on /v1/messages (#29698) - #30443

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955, actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02, docker/build-push-action@0adf9959216b96bec444f325f1e493d4aa344497, docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/