add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# md5 from https://pypi.python.org/pypi/futures/json, sha256 locally computed
md5    ced2c365e518242512d7a398b515ff95  futures-3.0.5.tar.gz
sha256    0542525145d5afc984c88f914a0c85c77527f65946617edb5274f72406f981df  futures-3.0.5.tar.gz