build(deps): bump engine.io and browser-sync in /src/main/resources/static#21

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dependabot/npm_and_yarn/src/main/resources/static/engine.io-and-browser-sync-6.2.1mis-lab/index:dependabot/npm_and_yarn/src/main/resources/static/engine.io-and-browser-sync-6.2.1Copy head branch name to clipboard