fix: fix incorrect nextjs peer deps version

[Howard86]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

fix incorrect nextjs peer deps version

• What is the current behavior? (You can also link to an open issue here)

when installing next-api-handler for next@13, it will show a warning of incorrect peer dependencies

• What is the new behavior (if this is a feature change)?

it will not show any warning for next version greater or equal than 9, i.e. >=9

• Other information:

[codecov[bot]]

Codecov Report

Merging #57 (2d4d9a1) into main (c729fda) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #57   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            6         6           
  Lines          148       148           
  Branches        21        21           
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  Hits           148       148           

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[codeclimate[bot]]

Code Climate has analyzed commit 2d4d9a18 and detected 0 issues on this pull request.

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