Bump qs and http-server in /amp-stories#403

dependabot[bot] wants to merge 1 commit intomainampproject/samples:mainfrom

dependabot/npm_and_yarn/amp-stories/qs-and-http-server-6.11.0ampproject/samples:dependabot/npm_and_yarn/amp-stories/qs-and-http-server-6.11.0Copy head branch name to clipboard