fix: correct access-control-allow-methods cors header name

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#19057

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This corrects the CORS header name we were applying

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #944 (8584ca5) into main (90cf636) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #944   +/-   ##
=======================================
  Coverage   67.77%   67.77%           
=======================================
  Files          59       59           
  Lines        6010     6010           
  Branches      676      676           
=======================================
  Hits         4073     4073           
  Misses       1928     1928           
  Partials        9        9           

Impacted Files	Coverage Δ
src/options.ts	86.76% <100.00%> (ø)

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