checkupdates: Disable filesystem sandbox for pacman v7.1.0 compatibility

Robin Candaurequested to merge
antiz/pacman-contrib:checkupdates_pacman_7.1 into master

Pacman v7.1.0 release includes hardening for sandbox features, preventing the usage of fakeroot.

checkupdate's pacman call now requires to disable filesystem sandboxing (via the new --disable-sandbox-filesystem option) for the fakeroot context to work properly.

Fixes #140 (closed)

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