chore(deps): bump rexml from 3.4.2 to 3.4.4

Bumps [rexml](https://github.com/ruby/rexml) from 3.4.2 to 3.4.4.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.4.2...v3.4.4)

---
updated-dependencies:
- dependency-name: rexml
  dependency-version: 3.4.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -547,7 +547,7 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    rexml (3.4.2)
+    rexml (3.4.4)
     rinku (2.0.6)
     rollbar (3.7.0)
     rouge (3.30.0)