Fix Issue #6382 Firebase not working for NextJs >=v13.5.0

[Ferido07]

Fixes #6382

Due to braking changes on the signature of loadConfig (https://github.com/vercel/next.js/blob/d96e0258de2caf34e9322d0d32ab5748533c4465/packages/next/src/server/config.ts#L784) Firebase does not deploy correctly.

Description

Scenarios Tested

Sample Commands

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 54.70%. Comparing base (67f7480) to head (b513b29).
⚠️ Report is 1384 commits behind head on master.

Files with missing lines	Patch %	Lines
src/frameworks/next/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6383   +/-   ##
=======================================
  Coverage   54.69%   54.70%           
=======================================
  Files         346      346           
  Lines       23670    23670           
  Branches     4870     4870           
=======================================
+ Hits        12946    12948    +2     
+ Misses       9531     9529    -2     
  Partials     1193     1193           

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