[ci] use LightGBM CI image for building aarch64 wheels (fixes #5595) #5622
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Fixes #5595.
Now that the container image from https://github.com/guolinke/lightgbm-ci-docker/blob/master/dockers/manylinux2014_aarch64/Dockerfile has been published, it's not necessary to build PoCL on every run of LightGBM's CI.
As @jgiannuzzi mentioned in #5252 (comment)