Bump @sentry/browser from 5.21.1 to 5.21.3 (#2068)

Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 5.21.1 to 5.21.3.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/5.21.1...5.21.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -19,7 +19,7 @@
     ]
   },
   "dependencies": {
-    "@sentry/browser": "5.21.1",
+    "@sentry/browser": "5.21.3",
     "@sentry/integrations": "5.21.1",
     "@testing-library/jest-dom": "5.11.3",
     "@testing-library/react": "10.4.8",