Bump @testing-library/user-event from 12.6.2 to 12.8.3#17

dependabot[bot] wants to merge 1 commit intomasteralexanderson/alexanderson.github.io:masterfrom

dependabot/npm_and_yarn/testing-library/user-event-12.8.3alexanderson/alexanderson.github.io:dependabot/npm_and_yarn/testing-library/user-event-12.8.3Copy head branch name to clipboard