fix: make request and response types explicit

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

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

[codecov]

Codecov Report

Merging #489 (724964b) into main (6c14ff9) will increase coverage by 0.52%.
The diff coverage is 100.00%.

❗ Current head 724964b differs from pull request most recent head 4686f57. Consider uploading reports for the commit 4686f57 to get more accurate results

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
+ Coverage   82.27%   82.79%   +0.52%     
==========================================
  Files          31       31              
  Lines        3481     3424      -57     
  Branches      516      515       -1     
==========================================
- Hits         2864     2835      -29     
+ Misses        617      589      -28     

Files Changed	Coverage Δ
src/event/utils.ts	72.38% <100.00%> (+9.70%)	⬆️

... and 2 files with indirect coverage changes