Lock rexml version until strscan can fix their setup issue.

Gemfile

@@ -7,10 +7,10 @@ gemspec
 
 gem "bundler", "< 2.5" # 2.4.x is the latest that supports Ruby 2.7, which is the minimum required by Arkana
 gem "rake"
+gem "rexml", "<3.2.7" # There's a bug preventing this from building on GHA arm64 CI. See: https://github.com/ruby/strscan/issues/104
 gem "rspec"
 gem "rubocop"
 gem "rubocop-rake"
 gem "rubocop-rspec"
 gem "simplecov", require: false, group: :test
-gem "strscan", "~> 1", "< 3" # Required by REXML, which is a dependency of RuboCop. There's a bug on v3 preventing it from building on arm64
 gem "tty-prompt"

Gemfile.lock

@@ -25,8 +25,7 @@ GEM
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.9.2)
-    rexml (3.3.0)
-      strscan
+    rexml (3.2.6)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -64,7 +63,6 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    strscan (1.0.3)
     tty-color (0.6.0)
     tty-cursor (0.7.1)
     tty-prompt (0.23.1)
@@ -89,12 +87,12 @@ DEPENDENCIES
   arkana!
   bundler (< 2.5)
   rake
+  rexml (< 3.2.7)
   rspec
   rubocop
   rubocop-rake
   rubocop-rspec
   simplecov
-  strscan (~> 1, < 3)
   tty-prompt
 
 BUNDLED WITH