Merge pull request #2361 from freeCodeCamp/dependabot/bundler/rexml-3.3.9

Bump rexml from 3.2.9 to 3.3.9

Gemfile.lock

@@ -88,8 +88,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.6.0)
-    rexml (3.2.9)
-      strscan
+    rexml (3.3.9)
     rouge (1.11.1)
     rr (3.1.1)
     rss (0.3.1)
@@ -125,7 +124,6 @@ GEM
       unicode-display_width (>= 1.5, < 3.0)
       unicode_utils (~> 1.4)
     strings-ansi (0.2.0)
-    strscan (1.0.3)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     terser (1.2.4)