chore: update npm audit ignore list

[rpl]

All CI jobs are currently failing on the "npm audit" step, due to a json-schema advisory introduced by request npm package through transitive dependencies originated by:

• addons-linter 3.23.0 through dispensary (which is actually already fixed in addons-linter >= 4.1.0 where the dispensary dependency has been merged into addons-linter project and request npm package replaced by node-fetch)
• sign-addon (which does currently use request as one of its direct dependencies)

This PR includes the following changes:

• Removed from audit ignore list old trim-off-newlines advisories.
• Added json-schema advisory to npm audit ignore list

This PR is mainly meant to allow us to unblock the CI jobs in the short run (and in particular to allow #2350 to pass all CI jobs and get rid of one of the two dependencies that are currently introducing a transitive dependency for the request package), but we also follow up to remove from the ignore list at least the advisories that are related to non-"dev-only" dependencies:

• Remove json-schema npm audit ignore entry from nsprc #2358

[codecov]

Codecov Report

Merging #2357 (c87a136) into master (72d7e90) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2357   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
=======================================
  Files          32       32           
  Lines        1700     1700           
=======================================
  Hits         1698     1698           
  Misses          2        2           

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