fix: workspaces/arborist/test/fixtures/tap-with-yarn-lock/node_module…

…s/mkdirp/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-LODASH-1040724
- https://snyk.io/vuln/SNYK-JS-HAWK-6969142
- https://snyk.io/vuln/SNYK-JS-MINIMIST-559764
- https://snyk.io/vuln/SNYK-JS-LODASH-6139239
- https://snyk.io/vuln/SNYK-JS-JSYAML-174129
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908
- https://snyk.io/vuln/SNYK-JS-SEMVER-3247795
- https://snyk.io/vuln/SNYK-JS-LODASH-450202
- https://snyk.io/vuln/SNYK-JS-LODASH-608086
- https://snyk.io/vuln/SNYK-JS-LODASH-73638
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116
- https://snyk.io/vuln/npm:hoek:20180212
- https://snyk.io/vuln/npm:lodash:20180130
- https://snyk.io/vuln/SNYK-JS-LODASH-73639
- https://snyk.io/vuln/npm:tunnel-agent:20170305
- https://snyk.io/vuln/SNYK-JS-MINIMATCH-1019388
- https://snyk.io/vuln/npm:minimatch:20160620
- https://snyk.io/vuln/SNYK-JS-REQUEST-3361831
- https://snyk.io/vuln/SNYK-JS-TOUGHCOOKIE-5672873
- https://snyk.io/vuln/SNYK-JS-JSYAML-173999
- https://snyk.io/vuln/SNYK-JS-HAWK-2808852
- https://snyk.io/vuln/SNYK-JS-MINIMIST-2429795
- https://snyk.io/vuln/SNYK-JS-LODASH-1018905
- https://snyk.io/vuln/SNYK-JS-MINIMATCH-3050818