chore(deps): bump rexml from 3.3.9 to 3.4.2 (#15337)

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Gemfile.lock

@@ -150,7 +150,7 @@ GEM
     open4 (1.3.4)
     public_suffix (4.0.7)
     rchardet (1.8.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     ruby-macho (2.5.1)
     ruby2_keywords (0.0.5)
     sawyer (0.9.2)