fix(types): correct app.on(method,path[],middleware,handler) type

[yusukebe]

Fixes #3795

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[github-actions]

Bundle size check

	main (5af7b4f)	#3802 (14f5a24)	+/-
Bundle Size (B)	18,771B	18,771B	0B
Bundle Size (KB)	18.33K	18.33K	0K

Compiler Diagnostics

	main (5af7b4f)	#3802 (14f5a24)	+/-
Files	257	257	0
Lines	115,049	115,049	0
Identifiers	112,029	112,032	3
Symbols	243,515	243,516	1
Types	204,779	204,790	11
Instantiations	3,044,345	3,044,415	70
Memory used	424,343K	421,919K	-2,424K
I/O read	0.03s	0.03s	0s
I/O write	0s	0s	0s
Parse time	0.77s	0.8s	0.03s
Bind time	0.34s	0.36s	0.02s
Check time	5.77s	5.39s	-0.38s
Emit time	0s	0s	0s
Total time	6.88s	6.55s	-0.33s

---

Reported by octocov

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.71%. Comparing base (5af7b4f) to head (8bf4d5c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3802   +/-   ##
=======================================
  Coverage   91.71%   91.71%           
=======================================
  Files         160      160           
  Lines       10195    10195           
  Branches     2856     2862    +6     
=======================================
  Hits         9350     9350           
  Misses        844      844           
  Partials        1        1           

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