fix(webhooks): raise ValueError for non-ASCII signature in Webhooks.verify

[RaphaelFakhri]

Summary

Webhooks.verify raises TypeError instead of ValueError when the svix-signature header contains a non-ASCII character, because hmac.compare_digest rejects non-ASCII str arguments. The fix compares the UTF-8 encoded bytes, so a malformed signature falls through to ValueError("no matching signature found"), the documented failure mode.

Changes

• Encode both signatures to bytes before hmac.compare_digest in resend/webhooks/_webhooks.py.
• Add test_verify_non_ascii_signature to tests/webhooks_test.py.

Testing

• The new test fails before the fix (TypeError) and passes after.
• pytest tests: 700 passed.
• flake8 --max-line-length=130 resend is clean.

---

Summary by cubic

Update Webhooks.verify so a non-ASCII svix-signature header raises the documented ValueError("no matching signature found") instead of a TypeError.

• Compares UTF-8 encoded bytes in hmac.compare_digest so malformed input falls through to the documented failure mode, covering both non-ASCII characters and unpaired surrogates that arrive via surrogateescape decoding.
• Adds regression tests for non-ASCII and unpaired-surrogate signatures.
• Bumps the package version to 2.49.1.

^{Written for commit e514de0. Summary will update on new commits.}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.04%. Comparing base (7f1acd0) to head (e514de0).
⚠️ Report is 239 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #290       +/-   ##
===========================================
+ Coverage   82.66%   97.04%   +14.37%     
===========================================
  Files           4       74       +70     
  Lines          75     4266     +4191     
===========================================
+ Hits           62     4140     +4078     
- Misses         13      126      +113     

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