fix: corrupt data in routes() response due to healthchecker data #987

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	1m 40s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	1m 38s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	1m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	1m 38s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	1m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	1m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	1m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	1m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	1m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	1m 39s
	16m 29s

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