fix(example): Fix Prisma example (#8046)
### Description
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Fix missing dependency `tsup` and incorrect import path of the
`database` package of the `with-prisma` example.
I was boostrapping an app using the prisma example and ran into some
errors mostly likely caused by some minor missing pieces in the previous
update https://github.com/vercel/turbo/pull/6571. This patch should fix
them.
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Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
