This switches away from the ruby-magic-static fork to bring
in the latest upstream changes. In particular, this fixes
Ruby interprets that are not built with `--enable-static`:
https://github.com/kwilczynski/ruby-magic/issues/6

Changes:
https://my.diffend.io/gems/ruby-magic/0.3.1/0.3.2

Diff from ruby-magic-static:
https://gitlab.com/gitlab-org/ruby-magic/-/merge_requests/8/diffs