fix: corrected minimum in healthcheck schema

[Neilblaze]

Description

It's meaningless to use zero as the minimum in schema_def.lua which was set to use as a default healthcheck in #5589.

Fixes #8937

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

cc: @spacewander, @navendu-pottekkat

[Neilblaze]

@spacewander would you mind having a look at the (nginx) err that I'm facing from the CI test? I noticed that it's specifically because of these two :

apisix/apisix/core.lua

Line 21 in 8d38884

error("failed to parse yaml config: " .. err)

apisix/apisix/core/config_local.lua

Line 71 in 8d38884

error(err)

[github-actions]

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[moonming]

@monkeyDluffy6017 please take a look

[monkeyDluffy6017]

hi @Neilblaze, It's designed on purpose, when the configuration is set to 0, it will never report healthy status