build(deps-dev): bump immutable from 5.1.6 to 5.1.9 in /frontend/src/angular#120

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dependabot/npm_and_yarn/frontend/src/angular/immutable-5.1.9Angular2Guy/AngularAndSpring:dependabot/npm_and_yarn/frontend/src/angular/immutable-5.1.9Copy head branch name to clipboard