Bump rollbar from 3.6.0 to 3.6.1

Bumps [rollbar](https://github.com/rollbar/rollbar-gem) from 3.6.0 to 3.6.1.
- [Release notes](https://github.com/rollbar/rollbar-gem/releases)
- [Changelog](https://github.com/rollbar/rollbar-gem/blob/master/CHANGELOG.md)
- [Commits](rollbar/rollbar-gem@v3.6.0...v3.6.1)

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

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

Gemfile.lock

@@ -498,7 +498,7 @@ GEM
       rack (>= 1.4)
     retriable (3.1.2)
     rexml (3.4.1)
-    rollbar (3.6.0)
+    rollbar (3.6.1)
     rouge (4.1.3)
     rsolr (2.6.0)
       builder (>= 2.1.2)