build(deps): bump sentry-raven from 3.0.2 to 3.0.3
build(deps): bump sentry-raven from 3.0.2 to 3.0.3

Bumps [sentry-raven](https://github.com/getsentry/raven-ruby) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/getsentry/raven-ruby/releases)
- [Changelog](https://github.com/getsentry/raven-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/raven-ruby/compare/3.0.2...3.0.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
openmensa/openmensa,openmensa/openmensa,openmensa/openmensa,openmensa/openmensa