Bump rexml from 3.3.2 to 3.3.6 in the bundler group

Bumps the bundler group with 1 update: [rexml](https://github.com/ruby/rexml).


Updates `rexml` from 3.3.2 to 3.3.6
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.3.2...v3.3.6)

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

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

Gemfile.lock

@@ -164,7 +164,7 @@ GEM
  thor (~> 1.0)
  rainbow (3.1.1)
  rake (13.2.0)
- rexml (3.3.2)
+ rexml (3.3.6)
  strscan
  rspec (3.13.0)
  rspec-core (~> 3.13.0)