chore: update export conditions

[Hebilicious]

Hello there ! The official runtime export key for cloudflare is workerd (not worker). I believe many apps out there might already be relying on worker so I propose to add it alongside it.

Reference :

• https://developers.cloudflare.com/workers/wrangler/bundling/#conditional-exports

• https://runtime-keys.proposal.wintercg.org/#workerd

[porsager]

Read from here on down for why it was changed from workerd to worker originally. https://github.com/porsager/postgres/pull/618#issuecomment-1693173590

Would be great to get a confirmation from cloudflare if they now think workerd is the way to go before merging, but my own tests seem to have no problems with workerd

[elithrar]

@porsager - workerd is the correct export. Also see https://runtime-keys.proposal.wintercg.org/#workerd

[porsager]

I'll merge this and remove the worker export for now, as it appears the cases where the worker export is requested actually needs the default esm export.