build: update node and npm engines versions

[nextcloud-command]

Automated update of the npm and node engines versions according to Nextcloud standards.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.29%. Comparing base (9d68c15) to head (a139548).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #812   +/-   ##
=======================================
  Coverage   17.29%   17.29%           
=======================================
  Files          12       12           
  Lines         584      584           
  Branches       67       67           
=======================================
  Hits          101      101           
  Misses        483      483           

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