Use cache directory as defined by XDG Base Directory Specification #728
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From the specification:
https://specifications.freedesktop.org/basedir-spec/basedir-spec-0.8.html
There is a single base directory relative to which user-specific
non-essential (cached) data should be written. This directory is defined
by the environment variable $XDG_CACHE_HOME.
$XDG_CACHE_HOME defines the base directory relative to which user specific
non-essential data files should be stored. If $XDG_CACHE_HOME is either
not set or empty, a default equal to $HOME/.cache should be used.