fix(hono-base): don't use Symbol for `COMPOSED_HANDLER` #6086

Job	Run time
Deno	14s
Main	2m 1s
Bun	9s
Checking if it's valid for JSR	10s
AWS Lambda	1m 3s
Node.js v18.18.2	1m 6s
workerd	1m 13s
Node.js v20.x	1m 7s
Node.js v22.x	1m 9s
Lambda@Edge	1m 7s
Type & Bundle size Check on Main	0s
Type & Bundle size Check on PR	1m 13s
Fastly Compute	1m 3s
Coverage	13s
	11m 48s

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