add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# Locally calculated
sha256 b7302ecc8ea3992d3bad96c0c4d56272e38d786d16cc1ad5964fefa73fd7c10b  stdlib-41.2.1-1.src.rock