(perf): use new healthcheck

[maximepiton]

Description of the change

Use the new healthcheck binary introduced in https://github.com/louislam/uptime-kuma/pull/2374 instead of the js one

Benefits

Avoid CPU spikes due to node processes spawn (See https://github.com/louislam/uptime-kuma/issues/2249)

Possible drawbacks

none

Applicable issues

none

Additional information

none

Checklist

• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Variables are documented in the README.md

[dirsigler]

Thank you very much @maximepiton !

Need to get better with tracking the changes from upstream side...