Bump rexml from 3.3.7 to 3.3.9 (#438)

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

Author: dependabot[bot]

Gemfile.lock

@@ -115,7 +115,7 @@ GEM
     rchardet (1.8.0)
     reverse_markdown (2.1.1)
       nokogiri
-    rexml (3.3.7)
+    rexml (3.3.9)
     rouge (4.4.0)
     safe_yaml (1.0.5)
     sass-embedded (1.79.1-arm64-darwin)