build(deps): bump eventsource and react-dev-utils

Bumps [eventsource](https://github.com/EventSource/eventsource) to 2.0.2 and updates ancestor dependency [react-dev-utils](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-dev-utils). These dependencies need to be updated together.


Updates `eventsource` from 0.1.6 to 2.0.2
- [Release notes](https://github.com/EventSource/eventsource/releases)
- [Changelog](https://github.com/EventSource/eventsource/blob/master/HISTORY.md)
- [Commits](https://github.com/EventSource/eventsource/compare/v0.1.6...v2.0.2)

Updates `react-dev-utils` from 5.0.3 to 12.0.1
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/main/CHANGELOG-1.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/react-dev-utils@12.0.1/packages/react-dev-utils)

---
updated-dependencies:
- dependency-name: eventsource
  dependency-type: indirect
- dependency-name: react-dev-utils
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -78,7 +78,7 @@
     "husky": "2.7.0",
     "identity-obj-proxy": "^3.0.0",
     "jest": "24.9.0",
-    "react-dev-utils": "^5.0.3",
+    "react-dev-utils": "^12.0.1",
     "react-test-renderer": "^16.10.1",
     "reactifex": "1.1.1",
     "redux-mock-store": "^1.5.3",