Bump sentry-rails from 4.8.0 to 4.8.1

Bumps [sentry-rails](https://github.com/getsentry/sentry-ruby) from 4.8.0 to 4.8.1.
- [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/4.8.0...4.8.1)

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

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

Gemfile.lock

@@ -461,9 +461,9 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2)
     semantic_range (3.0.0)
-    sentry-rails (4.8.0)
+    sentry-rails (4.8.1)
       railties (>= 5.0)
-      sentry-ruby-core (~> 4.8.0)
+      sentry-ruby-core (~> 4.8.1)
     sentry-ruby (4.8.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       faraday (>= 1.0)