fix(deps): update dependency @netlify/plugin-nextjs to ^5.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@netlify/plugin-nextjs (source)	^5.12.0 -> ^5.12.1

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Release Notes

opennextjs/opennextjs-netlify (@​netlify/plugin-nextjs)

v5.12.1

Compare Source

Bug Fixes

• fail build/deploy when using not yet unsupported Node.js Midleware (#​3016) (8c86b77)

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