build(deps): bump immutable from 4.1.0 to 4.3.9 in /aio/content/demos/first-app#21

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dependabot/npm_and_yarn/aio/content/demos/first-app/immutable-4.3.9bitovi/angular:dependabot/npm_and_yarn/aio/content/demos/first-app/immutable-4.3.9Copy head branch name to clipboard