fix: clusterpost/src/clusterpost-server/package.json & clusterpost/src/clusterpost-server/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-TAR-6476909
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116

Author: snyk-bot