Bump sentry/sentry-symfony from 3.0.0 to 3.1.0

Bumps [sentry/sentry-symfony](https://github.com/getsentry/sentry-symfony) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/getsentry/sentry-symfony/releases)
- [Changelog](https://github.com/getsentry/sentry-symfony/blob/master/CHANGELOG.md)
- [Commits](getsentry/sentry-symfony@3.0.0...3.1.0)

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