chore: normalize AuthError message

[k-taro56]

☕️ Reasoning

Messages passed to the constructor of a class that extends AuthError must not end with a period '.'.
Ending with a period '.' causes the constructor to normalize and add a double period '..'.

next-auth/packages/core/src/errors.ts

Line 76 in b420d36

this.message += `${this.message ? ". " : ""}Read more at ${url}`

I have checked that other error messages do not end with a period.

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

No Issue

📌 Resources

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

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2024 2:46pm

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
next-auth-docs	⬜️ Ignored (Inspect)	Visit Preview		Jun 14, 2024 2:46pm

[vercel]

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[codecov]

Codecov Report

Attention: Patch coverage is 38.09524% with 13 lines in your changes missing coverage. Please review.

Project coverage is 40.10%. Comparing base (d38fdef) to head (1fef09d).

Files	Patch %	Lines
...ages/core/src/lib/actions/callback/oauth/checks.ts	20.00%	8 Missing ⚠️
packages/core/src/lib/utils/assert.ts	50.00%	4 Missing ⚠️
packages/core/src/providers/webauthn.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10964      +/-   ##
==========================================
- Coverage   40.10%   40.10%   -0.01%     
==========================================
  Files         178      178              
  Lines       28527    28525       -2     
  Branches     1240     1246       +6     
==========================================
- Hits        11440    11439       -1     
+ Misses      17087    17086       -1     

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