fix: properly close middleware using next()

[angeloashmore]

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

This fixes a bug where r19's Express middleware would prematurely close the response before it completed. The bug seems isolated to usage in h3 (tests in Express worked before this PR).

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

[github-actions]

size-limit report 📦

Path	Size
./dist/index.cjs	7.79 KB (-0.02% 🔽)
./dist/index.js	7.87 KB (+0.05% 🔺)
./dist/client/index.cjs	7.29 KB (0%)
./dist/client/index.js	7.43 KB (0%)

[codecov-commenter]

Codecov Report

Base: 86.92% // Head: 86.96% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (e128e7f) compared to base (7d7d43a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   86.92%   86.96%   +0.04%     
==========================================
  Files           9        9              
  Lines         650      652       +2     
  Branches       58       58              
==========================================
+ Hits          565      567       +2     
  Misses         84       84              
  Partials        1        1              

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

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