fix: exercises/udacity-c2-restapi/package.json & exercises/udacity-c2…

…-restapi/package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908
- https://snyk.io/vuln/SNYK-JS-DOTTIE-3332763
- https://snyk.io/vuln/SNYK-JS-INI-1048974
- https://snyk.io/vuln/SNYK-JS-LODASH-1018905
- https://snyk.io/vuln/SNYK-JS-LODASH-1040724
- https://snyk.io/vuln/SNYK-JS-LODASH-567746
- https://snyk.io/vuln/SNYK-JS-LODASH-608086
- https://snyk.io/vuln/SNYK-JS-MINIMATCH-3050818
- https://snyk.io/vuln/SNYK-JS-MINIMIST-2429795
- https://snyk.io/vuln/SNYK-JS-MOMENT-2440688
- https://snyk.io/vuln/SNYK-JS-MOMENT-2944238
- https://snyk.io/vuln/SNYK-JS-SEMVER-3247795
- https://snyk.io/vuln/SNYK-JS-TAR-1536528
- https://snyk.io/vuln/SNYK-JS-TAR-1536531
- https://snyk.io/vuln/SNYK-JS-TAR-1536758
- https://snyk.io/vuln/SNYK-JS-TAR-1579147
- https://snyk.io/vuln/SNYK-JS-TAR-1579152
- https://snyk.io/vuln/SNYK-JS-TAR-1579155
- https://snyk.io/vuln/npm:debug:20170905