Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 5.20.1 to 5.21.1.
- [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/5.20.1...5.21.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>