Bump rexml from 3.3.1 to 3.3.6 in /updater (#10488)

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.1 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@v3.3.1...v3.3.6)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

updater/Gemfile.lock

@@ -297,7 +297,7 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    rexml (3.3.1)
+    rexml (3.3.6)
       strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)