Bump rexml from 3.3.6 to 3.3.9 (#1985)

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

Gemfile.lock

@@ -67,14 +67,12 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rouge (4.2.1)
     safe_yaml (1.0.5)
     sass-embedded (1.75.0)
       google-protobuf (>= 3.25, < 5.0)
       rake (>= 13.0.0)
-    strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     unicode-display_width (2.5.0)