Bump rexml from 3.2.5 to 3.3.3 (#12)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.3.3.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.3.3)

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

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

Gemfile.lock

@@ -24,7 +24,8 @@ GEM
       parser (~> 3.2.0)
       rainbow (>= 2.0, < 4.0)
     regexp_parser (2.8.1)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rubocop (0.92.0)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
@@ -49,6 +50,7 @@ GEM
     standard (0.7)
       rubocop (= 0.92)
       rubocop-performance (= 1.8.1)
+    strscan (3.1.0)
     unicode-display_width (1.8.0)
 
 PLATFORMS