Update rexml to version 3.4.4 (#52)

Co-authored-by: depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>

Author: depfu[bot]

Gemfile.lock

@@ -471,7 +471,7 @@ GEM
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
-    rexml (3.4.1)
+    rexml (3.4.4)
     rolify (6.0.1)
     rqrcode (2.2.0)
       chunky_png (~> 1.0)