build(deps): bump immutable from 4.0.0-rc.12 to 4.2.4 in /atcoder-problems-frontend#70

dependabot[bot] wants to merge 1 commit intomasterccppjsrb/AtCoderProblems:masterfrom

dependabot/npm_and_yarn/atcoder-problems-frontend/immutable-4.2.4ccppjsrb/AtCoderProblems:dependabot/npm_and_yarn/atcoder-problems-frontend/immutable-4.2.4Copy head branch name to clipboard