fix: update @opennextjs/aws dependency version to 756

[conico974]

There has been a few changes in opennextjs/opennextjs-aws#725 to handle the node middleware.
It also includes changes for next 15.2 and page router data json not working opennextjs/opennextjs-aws#756
It changes the dependency on aws to "@opennextjs/aws": "https://pkg.pr.new/@opennextjs/aws@756"
This PR just add the necessary changes in cloudflare so that we could merge it in aws.

Technically the node middleware should just work in cloudflare but i haven't tested it (and i'm not sure if it even make sense)

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Latest commit: bfc26de

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[pkg-pr-new]

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pnpm add https://pkg.pr.new/@opennextjs/cloudflare@403

commit: bfc26de

[vicb]

Thanks!

[conico974]

I've put this as a draft for now. No need to merge this one until opennextjs/opennextjs-aws#725 is reviewed and merged.
And there is no rush since node middleware will likely stay in canary for now

[conico974]

Thanks for the review @vicb