[ci] use flag '--allow-releaseinfo-change' in some 'apt-get update' calls (#4524)
[ci] use flag '--allow-releaseinfo-change' in some 'apt-get update' calls (#4524)

* [ci] prefer 'apt update' to 'apt-get update' in some R builds

* use --allow-releaseinfo-change
microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM