Bump flatted from 3.3.3 to 3.4.2 in /docker/hello-world-sandbox#462

sathiya-nhs merged 2 commits intomasterNHSDigital/hello-world-api:masterfrom

dependabot/npm_and_yarn/docker/hello-world-sandbox/flatted-3.4.2NHSDigital/hello-world-api:dependabot/npm_and_yarn/docker/hello-world-sandbox/flatted-3.4.2Copy head branch name to clipboard