FreeSewing now uses NodeJS 18 -- specifically lts/hydrogen -- for its
development.
There is no specific reason to run 18, things will still work in 16
(lts/gallium) but Vercel who hosts/builds our sites will be dropping
support for Node 16 in about 6 months, so since we're gearing up for
a new major release (v3) this is the best time for us to also move
to Node 18.
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