Vulnerable dependency: npm-exists

[six5536]

The library includes npm-exists as a dependency which depends on a vulnerable version of cacheable-request

It appears npm-exists is not used, so could easily be removed.

NPM audit report:

got  <=11.8.3
Severity: high
Got allows a redirect to a UNIX socket - https://github.com/advisories/GHSA-pfrx-2q88-qq97
Depends on vulnerable versions of cacheable-request
No fix available
node_modules/got
  npm-exists  >=1.0.1
  Depends on vulnerable versions of got
  node_modules/npm-exists
    bitmark-grammar  *
    Depends on vulnerable versions of npm-exists
    node_modules/bitmark-grammar
      @getmorebrain/bitmark-parser-generator  *
      Depends on vulnerable versions of bitmark-grammar
      node_modules/@getmorebrain/bitmark-parser-generator