Bump rexml from 3.2.9 to 3.3.3

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.9 to 3.3.3.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.9...v3.3.3)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -22,7 +22,7 @@ GEM
     racc (1.8.0)
     rainbow (3.1.1)
     regexp_parser (2.9.2)
-    rexml (3.2.9)
+    rexml (3.3.3)
       strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)