fix: always check typeof BroadcastChannel

[maiconcarraro]

☕️ Reasoning

This PR #11470 fixed one issue, but bypassed the check for typeof BroadcastChannel which causes issue for Safari 15.3 or lower. See: #12936

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

Fixes: #12936

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[vercel]

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[ThangHuuVu]

The build is failing, could you ensure it pass before merging @maiconcarraro

[maiconcarraro]

@ThangHuuVu the pnpm scripts seems to be unfriendly to windows OS, so its a little bit harder to reproduce... but I addressed the Broadcast error from GH pipeline and all the null references were gone after it.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 39.18%. Comparing base (baa15f4) to head (2e5ae58).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/next-auth/src/react.tsx	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12937      +/-   ##
==========================================
- Coverage   39.19%   39.18%   -0.01%     
==========================================
  Files         200      200              
  Lines       31606    31612       +6     
  Branches     1374     1380       +6     
==========================================
  Hits        12388    12388              
- Misses      19218    19224       +6     

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