Bump rexml from 3.2.9 to 3.3.6

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.9 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@v3.2.9...v3.3.6) --- updated-dependencies: - dependency-name: rexml dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
  rainbow (3.1.1)
  rake (13.2.1)
  regexp_parser (2.8.0)
- rexml (3.2.9)
+ rexml (3.3.6)
  strscan
  rspec (3.13.0)
  rspec-core (~> 3.13.0)