Set renovate nodejs to below 21

[weeman1337]

Should prevent renovate from updating major node versions like here #844

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[HarHarLinks]

I think engines also applies to something other than nodejs, blocking by requesting changes to check...

[HarHarLinks]

Here, this change will fix also yarn to <21, which technically works but is unclean, so I object.

#833

[weeman1337]

I think engines also applies to something other than nodejs, blocking by requesting changes to check...

node is now pinned instead of engines

stale