Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 6.3.6 to 6.4.0.
- [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/6.3.6...6.4.0)
Signed-off-by: dependabot[bot] <support@github.com>