fix(aws-lambda): handle invalid header names in request processing

[yusukebe]

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 (3779927)	#4883 (0dfe5ea)	+/-
Bundle Size (B)	18,489B	18,489B	0B
Bundle Size (KB)	18.06K	18.06K	0K

Compiler Diagnostics (tsc)

	main (3779927)	#4883 (0dfe5ea)	+/-
Files	229	229	0
Lines	146,731	146,731	0
Identifiers	124,420	124,420	0
Symbols	150,435	150,435	0
Types	157,114	157,114	0
Instantiations	401,812	401,812	0
Memory used	254,150K	251,543K	-2,607K
I/O read	0.02s	0.02s	0s
I/O write	0s	0s	0s
Parse time	0.72s	0.56s	-0.16s
Bind time	0.28s	0.23s	-0.05s
Check time	1.49s	1.21s	-0.28s
Emit time	0.01s	0.01s	0s
Total time	2.51s	2s	-0.51s

Compiler Diagnostics (typescript-go)

	main (3779927)	#4883 (0dfe5ea)	+/-
Files	229	229	0
Lines	150,912	150,912	0
Identifiers	125,098	125,098	0
Symbols	190,741	190,741	0
Types	255,501	255,501	0
Instantiations	609,367	609,367	0
Memory used	162,018K	162,147K	129K
Memory allocs	1,768,059	1,768,433	374
Config time	0.001s	0s	-0.001s
BuildInfo read time	0.001s	0.001s	0s
Parse time	0.101s	0.074s	-0.027s
Bind time	0s	0s	0s
Check time	0.442s	0.341s	-0.101s
Emit time	0.012s	0.17s	0.158s
Changes compute time	0.025s	0.027s	0.002s
Total time	0.648s	0.641s	-0.007s

---

Reported by octocov

[github-actions]

HTTP Performance Benchmark

Framework	Runtime	Average	Ping	Query	Body
hono (origin/main)	bun	34,803.11	47,798.62	31,281.59	25,329.13
hono (current)	bun	36,031.83	51,094.21	31,607.72	25,393.57
Change		+3.53%	+6.89%	+1.04%	+0.25%

[yusukebe]

I think this is okay. I merge it immediately.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.90%. Comparing base (3779927) to head (48498e7).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/adapter/aws-lambda/handler.ts	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4883      +/-   ##
==========================================
- Coverage   92.90%   92.90%   -0.01%     
==========================================
  Files         177      177              
  Lines       11807    11817      +10     
  Branches     3522     3528       +6     
==========================================
+ Hits        10969    10978       +9     
- Misses        837      838       +1     
  Partials        1        1              

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