[Dependency] Bump qs, body-parser and express#576

bmcutler merged 2 commits intomainSubmitty/pdf-annotate.js:mainfrom

dependabot/npm_and_yarn/qs-and-body-parser-and-express-6.11.0Submitty/pdf-annotate.js:dependabot/npm_and_yarn/qs-and-body-parser-and-express-6.11.0Copy head branch name to clipboard