Bump rexml from 3.2.7 to 3.3.9 (#795)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.7 to 3.3.9.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.7...v3.3.9)

---
updated-dependencies:
- dependency-name: rexml
  dependency-version: 3.3.9
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -254,8 +254,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.7)
-      strscan (>= 3.0.9)
+    rexml (3.3.9)
     rouge (3.30.0)
     rubyzip (2.4.1)
     safe_yaml (1.0.5)
@@ -268,7 +267,6 @@ GEM
       addressable (>= 2.3.5)
       faraday (>= 0.17.3, < 3)
     simpleidn (0.2.3)
-    strscan (3.1.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     typhoeus (1.4.0)