cvat-ui build fails on node 17 due to an open-ssl hash incompatibility #706

The latest version of node (17) breaks cvat-ui with an ERR_OSSL_EVP_UNSUPPORTED error.

See https://stackoverflow.com/questions/69394632/webpack-build-failing-with-err-ossl-evp-unsupported

To get it working locally, I changed the Dockerfile to use node:16-slim instead of node:lts-slim