Bump rexml from 3.2.9 to 3.3.0

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.9 to 3.3.0.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.9...v3.3.0)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
     rdoc (6.6.3.1)
       psych (>= 4.0.0)
     regexp_parser (2.9.2)
-    rexml (3.2.9)
+    rexml (3.3.0)
       strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)