Bug 1786582 - Update fluent and fluent-react in newtab. r=barret

...mponents/newtab/content-src/asrouter/asrouter-content.jsx

...tab/content-src/asrouter/components/RichText/RichText.jsx

...mponents/newtab/content-src/asrouter/rich-text-strings.js

.../components/newtab/data/content/activity-stream.bundle.js

browser/components/newtab/karma.mc.config.js

browser/components/newtab/package-lock.json

browser/components/newtab/package.json

...er/components/newtab/test/unit/asrouter/RichText.test.jsx

...s/newtab/test/unit/asrouter/templates/EOYSnippet.test.jsx

...ab/test/unit/asrouter/templates/FXASignupSnippet.test.jsx

...b/test/unit/asrouter/templates/NewsletterSnippet.test.jsx

...test/unit/asrouter/templates/SendToDeviceSnippet.test.jsx

...unit/asrouter/templates/SimpleBelowSearchSnippet.test.jsx

...ewtab/test/unit/asrouter/templates/SimpleSnippet.test.jsx

...b/test/unit/asrouter/templates/SubmitFormSnippet.test.jsx

browser/components/newtab/webpack.system-addon.config.js