fix: add nextCookies to better-auth plugins for server action

[HimanshuKumarDutt094]

Closes #2157

✅ Checklist

• I have followed every step in the contributing guide (updated 2022-10-06).
• The PR title follows the convention we established conventional-commit
• I performed a functional test on my final commit

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Changelog

added nextCookies plugin following better auth new docs

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💯

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