Bump sentry-rails from 4.7.3 to 4.8.0

Bumps [sentry-rails](https://github.com/getsentry/sentry-ruby) from 4.7.3 to 4.8.0.
- [Release notes](https://github.com/getsentry/sentry-ruby/releases)
- [Changelog](https://github.com/getsentry/sentry-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-ruby/compare/4.7.3...4.8.0)

---
updated-dependencies:
- dependency-name: sentry-rails
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -461,14 +461,14 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2)
     semantic_range (3.0.0)
-    sentry-rails (4.7.3)
+    sentry-rails (4.8.0)
       railties (>= 5.0)
-      sentry-ruby-core (~> 4.7.0)
-    sentry-ruby (4.7.3)
+      sentry-ruby-core (~> 4.8.0)
+    sentry-ruby (4.8.0)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       faraday (>= 1.0)
-      sentry-ruby-core (= 4.7.3)
-    sentry-ruby-core (4.7.3)
+      sentry-ruby-core (= 4.8.0)
+    sentry-ruby-core (4.8.0)
       concurrent-ruby
       faraday
     set (1.0.2)