Is your feature request related to a problem? Please describe.
Node v14 reaching its end of life this month. Loopback removes support for node v14 in all of its packages we depend on.

Sourceloop packages/services also currently have v12 and v14 as the supported versions.

Describe the solution you'd like
Remove the support for node v14 and v12. And add the support for the latest LTS version v18.

Describe alternatives you've considered
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Additional context
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