(WIP) zod-openapi: use defu instead of ts-deepmerge

[zsilbi]

Hello!

I get ts_deepmerge_1.default is not a function errors when running a bundled version of my project with workerd. The root cause of this is that the merge function from ts-deepmerge is exported in a very weird way, and the bundler can't really figure out how to include it properly.

I propose a switch from ts-deepmerge to defu

defu has a different order of priority for the passed parameters than ts-deepmerge. The left-most parameter is the highest. Can this be an issue?

Thanks,
zsilbi

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