Bump sentry-raven from 3.0.3 to 3.0.4 (#1754)

Bumps [sentry-raven](https://github.com/getsentry/raven-ruby) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/getsentry/raven-ruby/releases)
- [Changelog](https://github.com/getsentry/raven-ruby/blob/master/CHANGELOG.md)
- [Commits](getsentry/sentry-ruby@3.0.3...3.0.4)

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

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

Gemfile.lock

@@ -212,7 +212,7 @@ GEM
     selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
-    sentry-raven (3.0.3)
+    sentry-raven (3.0.4)
       faraday (>= 1.0)
     shoulda-matchers (4.4.1)
       activesupport (>= 4.2.0)