fix(adapter/aws-lambda): remove unneeded import and compatibility for LLRT #6265

Job	Run time
Deno	13s
Checking if it's valid for JSR	9s
Bun	8s
Fastly Compute	49s
AWS Lambda	48s
Lambda@Edge	50s
Main	1m 54s
Node.js v18.18.2	51s
Type & Bundle size Check on Main	0s
Node.js v20.x	52s
Type & Bundle size Check on PR	58s
Node.js v22.x	52s
workerd	48s
Coverage	9s
	9m 21s

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