Merge pull request #24 from coderdojo-japan/dependabot/bundler/rexml-3.3.9

Bump rexml from 3.3.6 to 3.3.9

Author: yasulab

Gemfile.lock

@@ -120,8 +120,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.6.0)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rinku (2.0.6)
     rouge (4.1.2)
     ruby-rc4 (0.1.5)
@@ -132,7 +131,6 @@ GEM
       google-protobuf (~> 3.23)
     sass-embedded (1.64.1-x86_64-linux-gnu)
       google-protobuf (~> 3.23)
-    strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     timers (4.3.5)